Patent 7651245

Derivative works

Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.

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Derivative works

Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.

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Defensive Disclosure: US Patent 7651245 Derivative Variations

This document outlines a series of derivative variations based on US Patent 7651245, "LED light fixture with internal power supply," intended to serve as defensive disclosures. The purpose is to create prior art that may render future incremental improvements by competitors obvious or non-novel, thereby limiting the scope of potential new patent claims in this technological domain. The variations are derived from the independent claims (Claims 1, 11, and 21) of US7651245, expanding upon their core features across various technical axes.

Derivatives Based on Independent Claims

Claim 1: A light fixture comprising: a housing having a main body portion and a plurality of fins that extend from the main body portion, wherein the fins define a receptacle; a light engine assembly mounted to the main body portion, the light engine having a plurality of light modules comprising a LED and a zener diode mounted to a printed circuit board, the light engine further having a heat transfer element positioned between the circuit board and the body portion; and, a power module residing within the receptacle and connected to the main body portion, the power module including a box, an internal power supply, and an openable cover that encloses the power supply.

Derivative 1.1: Material & Component Substitution - High-Performance Polymer Composite Housing with Integrated Thermal Interface and Advanced Surge Protection.

  • Enabling Description: The housing (20) is fabricated from a high-thermal-conductivity polymer composite, specifically a polyether ether ketone (PEEK) matrix reinforced with 30% volume fraction of exfoliated graphene nanoplatelets (xGnP) and 20% volume fraction of hexagonal boron nitride (hBN) particles. This composite offers a bulk thermal conductivity exceeding 15 W/mK, significantly improving heat dissipation compared to traditional aluminum alloys while reducing weight and offering enhanced corrosion resistance. The printed circuit board (50) for the light engine assembly (15) is a metal-core PCB (MCPCB) utilizing an aluminum nitride (AlN) substrate with a copper circuit layer, directly bonded to the housing's main body (45) via a liquid metal thermal interface material (LM TIM) composed of gallium-indium-tin alloy. The zener diodes (18) within each LED module (M) are replaced with automotive-grade Transient Voltage Suppressor (TVS) diodes (e.g., SMAJ series, 600W peak pulse power, 10V breakdown voltage) for superior transient overvoltage protection, ensuring robust operation in electrically noisy environments. The internal power supply (25) utilizes silicon carbide (SiC) MOSFETs in its switching stage for increased efficiency and higher operating temperature tolerance, enclosed within a titanium alloy box (30) for structural integrity.
graph TD
    A[Power Input] --> B(SiC MOSFET Power Supply)
    B --> C(Ti Alloy Box)
    C -- Power Leads --> D[MCPCB with AlN Substrate]
    D -- LM TIM --> E[PEEK/Graphene/hBN Housing]
    E -- Heat Dissipation --> F(Ambient)
    D --> G{LED Modules with TVS Diodes}
    G --> H[Light Output]

Derivative 1.2: Operational Parameter Expansion - Cryogenic Environment Operation with Active Thermal Management.

  • Enabling Description: The light fixture is designed for continuous operation in cryogenic environments, specifically down to -100°C. The housing (20) is constructed from a specialized invar alloy (FeNi36) to minimize thermal expansion coefficient mismatch at extreme cold, with a multi-layer vacuum insulation panel (VIP) forming an outer jacket. The fins (40) are extended and designed with a larger surface area for efficient convective heat transfer to a circulating cryogen (e.g., gaseous nitrogen) within a closed-loop system integrated into the housing. The light engine assembly (15) utilizes LEDs (17) specifically rated for cryogenic temperatures (e.g., GaN-based LEDs with enhanced low-temperature efficiency). The PCB (50) is made from a polyimide-based flexible circuit material to withstand thermal cycling stress, with integrated platinum resistance thermometers (RTDs) for precise temperature monitoring. The heat transfer element (60) is a miniature Stirling cooler or a micro-Peltier array (thermoelectric cooler, TEC) actively managing the junction temperature of the LEDs, drawing power directly from the internal power supply (25). The power supply itself (25) is housed within a sealed, nitrogen-filled box (30) to prevent moisture ingress and dielectric breakdown at low temperatures, utilizing military-grade components specified for extended low-temperature operation.
stateDiagram
    state "Initialization (-100C)" as Init
    state "Normal Operation (-100C)" as Normal
    state "Module Failure" as Failure
    state "Maintenance / Shutdown" as Shutdown

    Init --> Normal: System Online, Temp Stable
    Normal --> Failure: LED/Zener Fault
    Failure --> Normal: Zener Bypass Engaged
    Normal --> Shutdown: Manual Shutdown
    Normal --> Normal: Active Cooling (Stirling/TEC)
    Failure --> Shutdown: Module Replacement

Derivative 1.3: Cross-Domain Application - Horticultural Grow Light with Spectral Tuning.

  • Enabling Description: The light fixture (10) is repurposed as a horticultural grow light for controlled environment agriculture. The housing (20) is coated with a hydrophobic, anti-fungal epoxy for protection against high humidity and nutrient sprays. The light engine assembly (15) features a plurality of multi-spectral LED modules (M), where each module includes an array of red (630-660nm), blue (440-470nm), far-red (730nm), and UV-A (385nm) LEDs, each with its own parallel zener diode (18) bypass circuit to maintain redundancy. The PCB (50) integrates individual current drivers for each spectral band, allowing for dynamic spectral tuning based on plant growth stage. The heat transfer element (60) consists of a composite phase-change material (PCM) integrated with graphite flakes to manage transient heat loads from varying spectral outputs. The power supply (25) within the receptacle (105) is a universal input, multi-channel constant current output type, capable of independently controlling the current to each spectral group.
graph TD
    A[AC Input] --> B(Multi-Channel Power Supply)
    B -- Red Channel --> C1(Red LED Array)
    B -- Blue Channel --> C2(Blue LED Array)
    B -- Far-Red Channel --> C3(Far-Red LED Array)
    B -- UV-A Channel --> C4(UV-A LED Array)
    C1 -- Zener Bypass --> D1(PCB with PCM/Graphite)
    C2 -- Zener Bypass --> D1
    C3 -- Zener Bypass --> D1
    C4 -- Zener Bypass --> D1
    D1 -- Housing/Fins --> E(Ambient)
    D1 --> F(Plant Canopy)

Derivative 1.4: Integration with Emerging Tech - IoT-Enabled Predictive Maintenance Lighting System.

  • Enabling Description: The light fixture (10) incorporates an array of Internet of Things (IoT) sensors for real-time performance monitoring. Each LED module (M) includes an integrated photodiode for individual luminous flux monitoring and a thermistor for junction temperature measurement. The power supply (25) integrates voltage, current, and ripple sensors at its output stage. A low-power microcontroller (e.g., ESP32-S3) is embedded within the power module's box (30), collecting data from these sensors. This data is wirelessly transmitted via a Thread network (IEEE 802.15.4-based mesh networking protocol) to a local gateway. An AI-driven optimization algorithm, deployed on the gateway, analyzes the sensor data to detect early signs of LED degradation (e.g., flux depreciation, color shift) or power supply component stress (e.g., increased ripple, temperature spikes). This algorithm predicts potential failures and proactively schedules maintenance alerts, displaying them via a centralized facility management dashboard. Furthermore, component serial numbers and manufacturing dates are recorded on a private blockchain (e.g., Hyperledger Fabric) during assembly, enabling verifiable supply chain tracking and authentication of replacement parts for maintenance.
sequenceDiagram
    participant LED_MOD as LED Module (Sensor)
    participant PS_MOD as Power Supply (Sensor)
    participant MCU as Microcontroller (Embedded)
    participant THREAD as Thread Network
    participant GATEWAY as IoT Gateway (AI)
    participant DMS as Dashboard/Maint. System
    participant BLOCKCHAIN as Hyperledger Fabric

    LED_MOD->>MCU: Send Temp, Flux Data
    PS_MOD->>MCU: Send V/I/Ripple Data
    MCU->>THREAD: Aggregate Data
    THREAD->>GATEWAY: Transmit Data
    GATEWAY->>GATEWAY: AI Predicts Failure (Degradation/Stress)
    GATEWAY->>DMS: Send Predictive Maint. Alert
    MCU->>BLOCKCHAIN: Record Component S/N & Maint. Event (via Gateway)
    DMS->>BLOCKCHAIN: Verify Part Authenticity

Derivative 1.5: The "Inverse" or Failure Mode - Graceful Degradation Emergency Lighting.

  • Enabling Description: The light fixture (10) is designed to transition into a "graceful degradation" emergency lighting mode upon detecting critical failures or power interruptions, rather than immediate cessation of light. The internal power supply (25) includes a secondary, low-power DC-DC converter and a supercapacitor bank (e.g., 200F at 48V) for energy storage, continuously charged during normal operation. Upon detection of a primary AC power loss or a major internal fault (e.g., primary power supply over-temperature, output short-circuit), the control circuitry (integrated with the microcontroller from Derivative 1.4, or a dedicated safety ASIC) instantly switches the LED modules (M) to operate from the supercapacitor bank via the secondary DC-DC converter. This mode selectively powers only a subset of the LED modules (e.g., every third module) at a reduced current (e.g., 20% of normal operating current) to provide essential egress illumination for a minimum duration (e.g., 90 minutes). The zener diodes (18) continue to function for individual LED bypass. The openable cover (65) can be removed to access the power module (70) for replacement of the supercapacitor bank at end-of-life.
stateDiagram
    state "Normal Operation (AC Power)" as Normal
    state "Primary Power Loss Detected" as PowerLoss
    state "Internal Fault Detected" as InternalFault
    state "Emergency Lighting (Supercapacitor)" as Emergency
    state "Full Shutdown" as Shutdown

    Normal --> PowerLoss: AC Mains Fail
    Normal --> InternalFault: PS Over-temp / Short
    PowerLoss --> Emergency: Activate Supercapacitor
    InternalFault --> Emergency: Activate Supercapacitor
    Emergency --> Shutdown: Supercapacitor Depleted / Manual

Claim 11: A LED light fixture comprising: a housing including a body portion and a plurality of fins extending rearward from the body portion, the fins defining a receptacle; a light engine assembly mounted to the body portion, the light engine having a plurality of light modules comprised of a LED and a zener diode mounted to a printed circuit board; and, a power module residing within the receptacle, the power module including a power supply residing within an openable box within the receptacle.

Derivative 11.1: Material & Component Substitution - Recycled Plastic Composite Housing and Flexible Power Module.

  • Enabling Description: The housing (20) is constructed from a recycled polyethylene terephthalate (rPET) and carbon black composite, achieving a minimum thermal conductivity of 2 W/mK through optimized filler dispersion. The fins (40) are integrally molded with the housing, featuring internal channels for enhanced airflow, but without active fans. The printed circuit board (50) is a flexible PCB (FPCB) utilizing a liquid crystal polymer (LCP) substrate, allowing it to conform to curved internal surfaces of the housing for optimized thermal contact area. The zener diodes (18) are ultra-low leakage silicon carbide (SiC) Schottky diodes, reducing power consumption in the bypass state. The power module's box (30) is also molded from rPET composite but designed with a living hinge feature for the openable cover (65), eliminating separate hinge components. The internal power supply (25) itself is a thin-film power supply, featuring integrated passive components and embedded within a flexible, thermally conductive polymer encapsulation, conforming to the contours of the box (30) for improved space utilization and resilience to vibration.
graph TD
    A[AC Input] --> B(Flexible Encapsulated PS)
    B -- Power Leads --> C(FPCB LCP Substrate)
    C --> D{LED Modules with SiC Schottky Diodes}
    D --> E[rPET Composite Housing/Fins]
    E -- Heat Dissipation --> F(Ambient)
    C --> G[Light Output]

Derivative 11.2: Operational Parameter Expansion - High-Altitude, Low-Pressure Operation.

  • Enabling Description: This LED light fixture is engineered for stable operation in high-altitude, low-pressure environments (e.g., above 10,000 meters / 30,000 feet, corresponding to pressures below 265 mbar). The housing (20) is designed with pressure equalization vents incorporating Gore-Tex® membranes to prevent pressure differentials while maintaining moisture protection. The fins (40) are optimized for rarefied air, featuring a larger aspect ratio and increased spacing to maximize heat dissipation via radiation and reduced convection. The interior of the housing, particularly the receptacle (105) for the power module (70), is evacuated and then backfilled with a high-thermal-conductivity gas like helium or hydrogen, and sealed, to enhance internal heat transfer in the low-pressure external environment. The power supply (25) components are hermetically sealed and chosen for their high Partial Discharge Inception Voltage (PDIV) to prevent corona discharge at low pressures. The LEDs (17) are housed with enhanced encapsulation materials to resist UV radiation and thermal cycling stresses characteristic of high altitudes.
classDiagram
    class Housing {
        +Invar Alloy (Pressure-Resistant)
        +Gore-Tex Vents
        +Large Aspect Ratio Fins (Low-P)
        +He/H2 Gas Filled Cavity
    }
    class LightEngine {
        +UV-Resistant Encapsulated LEDs
        +Polyimide FPCB
        +Zener Diodes
    }
    class PowerModule {
        +Hermetically Sealed PS (High PDIV)
        +Openable Ti Box
    }
    Housing "1" -- "1" LightEngine : mounts
    Housing "1" -- "1" PowerModule : contains
    LightEngine --|> LEDs : comprises
    PowerModule --|> PowerSupply : comprises

Derivative 11.3: Cross-Domain Application - Smart Street Lighting with Integrated Traffic Monitoring.

  • Enabling Description: The LED light fixture is adapted for smart street lighting applications, with the housing (20) integrated into a standard pole-mounted luminaire. The housing's fins (40) are extended downwards to serve as aesthetic elements that also house small, modular traffic monitoring sensors (e.g., radar speed sensors, passive infrared presence detectors). The power module (70) within the receptacle (105) includes the primary LED power supply (25) and an auxiliary power supply for these integrated sensors. The power supply is equipped with Power-over-Ethernet (PoE++) capabilities, delivering both power and data connectivity to the sensors and allowing for remote control of the light fixture. The light engine assembly (15) employs dynamically adjustable beam-forming lenses (e.g., liquid crystal lenses or micro-electromechanical system (MEMS) mirror arrays) to adapt illumination patterns based on real-time traffic flow detected by the integrated sensors. The openable box (30) allows easy access for swapping out sensor modules or upgrading the power supply for future smart city functionalities.
graph LR
    A[Grid Power] --> B(PoE++ Power Supply)
    B -- PoE++ --> C(Main Light Engine)
    C -- Light Output --> D(Roadway)
    B -- Aux Power --> E(Radar Speed Sensor)
    B -- Aux Power --> F(PIR Presence Detector)
    E -- Data --> B
    F -- Data --> B
    B -- Data (Ethernet) --> G(Central Control System)
    C -- Dynamic Lenses --> H(Adjustable Beam)

Derivative 11.4: Integration with Emerging Tech - Self-Calibrating, Mesh Networked Lighting.

  • Enabling Description: The LED light fixture features self-calibration capabilities and operates as a node in a wireless mesh network (e.g., using Bluetooth Mesh protocol). Each light module (M) includes an integrated color sensor (e.g., RGB ambient light sensor) that continuously monitors the emitted light's chromaticity and intensity. The embedded microcontroller (MCU) within the power module's box (30) processes this feedback. An internal PID control loop in the MCU adjusts the output current of the power supply (25) to compensate for LED aging and environmental factors, maintaining constant color temperature and brightness within predefined tolerances. Furthermore, each fixture (10) acts as a mesh node, relaying control commands (on/off, dimming, color changes) and status information (temperature, power consumption) across the network. Over-the-air (OTA) firmware updates are managed via the mesh network, ensuring the lighting system remains current and adaptable without physical intervention.
sequenceDiagram
    participant LED_FIXTURE_A as LED Fixture A
    participant LED_FIXTURE_B as LED Fixture B
    participant LED_FIXTURE_C as LED Fixture C
    participant CENTRAL_CONTROLLER as Central Controller

    CENTRAL_CONTROLLER->>LED_FIXTURE_A: Dim Command (Node A)
    LED_FIXTURE_A->>LED_FIXTURE_A: Adjust Brightness
    LED_FIXTURE_A->>LED_FIXTURE_A: Read Color Sensor, Temp Sensor
    LED_FIXTURE_A->>LED_FIXTURE_A: Calibrate Output (PID)
    LED_FIXTURE_A->>LED_FIXTURE_B: Relay Dim Command (Node B)
    LED_FIXTURE_B->>LED_FIXTURE_B: Adjust Brightness
    LED_FIXTURE_B->>LED_FIXTURE_B: Read Color Sensor, Temp Sensor
    LED_FIXTURE_B->>LED_FIXTURE_B: Calibrate Output (PID)
    LED_FIXTURE_B->>LED_FIXTURE_C: Relay Dim Command (Node C)
    LED_FIXTURE_C->>LED_FIXTURE_C: Adjust Brightness
    LED_FIXTURE_C->>LED_FIXTURE_C: Read Color Sensor, Temp Sensor
    LED_FIXTURE_C->>LED_FIXTURE_C: Calibrate Output (PID)
    LED_FIXTURE_C->>CENTRAL_CONTROLLER: Send Status Update (via mesh)

Derivative 11.5: The "Inverse" or Failure Mode - Intelligent Thermal Throttling for Extended Life.

  • Enabling Description: Instead of a hard failure, the light fixture (10) implements intelligent thermal throttling to extend its operational lifespan. The power supply (25) and light engine PCB (50) are equipped with multiple high-precision thermistors that feed data to an embedded microcontroller. When internal temperatures (e.g., LED junction temperature, power supply case temperature) exceed a pre-defined "soft limit" (e.g., 60°C for power supply, 75°C for LED junction), the microcontroller initiates a gradual reduction in the power supply's output current, resulting in a proportional dimming of the LEDs. This dimming rate is proportional to the temperature excursion above the soft limit. This prevents catastrophic overheating and significantly reduces stress on both the LEDs (17) and the power supply components, extending their mean time between failures (MTBF). The system logs these throttling events and their duration, accessible via a diagnostic port in the openable box (30), aiding in future predictive maintenance. The zener diode (18) bypass circuitry remains active for individual LED failures, ensuring the remainder of the array continues to operate even under throttling.
stateDiagram
    state "Normal Operation (Temp < Soft Limit)" as Normal
    state "Temperature Rising (Soft Limit)" as Rising
    state "Thermal Throttling (Dimming)" as Throttling
    state "Temperature Stable (Throttled)" as StableThrottled
    state "Critical Over-temp" as Critical

    Normal --> Rising: Temp crosses Soft Limit
    Rising --> Throttling: Initiate Current Reduction
    Throttling --> StableThrottled: Temp Stabilizes
    StableThrottled --> Normal: Temp drops below Soft Limit
    Throttling --> Critical: Temp continues to rise (unlikely)
    Critical --> Throttling: Emergency Shutdown (if beyond failsafe)

Claim 21: A LED light fixture comprising: a housing including a flange, an internal receiver, a frontal lens and an array of fins extending rearward from the flange to define a rear receptacle that extends forward towards the flange, the housing further including a rear cover that encloses the rear receptacle; a light engine assembly mounted to the receiver, the light engine having a plurality of light modules wherein each module includes both a LED mounted to a printed circuit board and an optical lens extending from the printed circuit board; a power supply residing within the rear receptacle and enclosed by the cover; and, wherein during operation, heat generated by the LEDs passes through the circuit board and then said heat is dissipated by the array of fins without the use of a fan.

Derivative 21.1: Material & Component Substitution - Aerogel-Insulated Housing with Boron Nitride Nanotube Fins.

  • Enabling Description: The housing (20) incorporates an internal layer of aerogel insulation (e.g., silica aerogel, 0.015 W/mK) directly behind the light engine assembly (15) to minimize heat transfer into the frontal lens (35) area, preventing thermal stress and optimizing optical performance. The array of fins (40) extending rearward from the flange (100) are fabricated from a carbon fiber composite with vertically aligned boron nitride nanotubes (BNNTs) infused in the matrix. This material provides anisotropic thermal conductivity, enhancing heat transfer along the length of the fins (e.g., 500 W/mK along the BNNT axis) while providing structural rigidity and reduced weight. The printed circuit board (50) is a ceramic substrate based on aluminum nitride (AlN) with thin-film copper traces for superior thermal conduction from the LEDs (17). The power supply (25) is miniaturized using gallium nitride (GaN) power semiconductors, allowing it to operate efficiently at higher switching frequencies and enabling a more compact form factor within the rear receptacle (105).
graph TD
    A[LED Module (AlN PCB)] --> B(Aerogel Insulation)
    A -- Heat Conduction --> C[Housing Main Body]
    C --> D(BNNT-Infused Fins)
    D -- Convection/Radiation --> E(Ambient)
    F[GaN Power Supply] --> G(Rear Receptacle)
    G --> A
    B -- Min. Heat Transfer --> H(Frontal Lens)

Derivative 21.2: Operational Parameter Expansion - High-Power Density with Two-Phase Thermosyphon Cooling.

  • Enabling Description: This fixture is designed for ultra-high power density applications (e.g., >200W/cm² light engine output). While still fan-less, passive heat dissipation is significantly augmented. The internal receiver (95) of the housing (20), onto which the light engine (15) is mounted, forms the evaporator section of a sealed, passive two-phase thermosyphon loop. A working fluid (e.g., deionized water or a dielectric fluid like HFE-7100) evaporates at the heat source (LED PCB), rises to the condenser section. The array of fins (40) is significantly enlarged and intricately designed with internal micro-channels that constitute the condenser, where the vapor condenses back to liquid and returns to the evaporator by gravity. The fins are manufactured with a high-purity aluminum alloy (e.g., Al 6061-T6) and surface-treated for enhanced emissivity. The power supply (25) is located in the rear receptacle (105) and benefits from indirect cooling by conductive contact with the housing's main body, which is now part of the thermosyphon system's cold plate.
graph TD
    A[LED Heat Source] --> B(Evaporator (Liquid turns to Vapor))
    B -- Vapor Flow (Gravity Assist) --> C(Condenser Fins (Vapor turns to Liquid))
    C -- Liquid Return (Gravity) --> B
    C -- Heat Dissipation --> D(Ambient)
    E[Power Supply] --> F(Receptacle)
    F -- Conduction (Indirect Cooling) --> G(Housing Main Body / Condenser)

Derivative 21.3: Cross-Domain Application - Bio-Illumination for Algae Cultivation Reactors.

  • Enabling Description: The LED light fixture is adapted for use as an internal bio-illumination source within photobioreactors for algae cultivation. The frontal lens (35) and housing (20) are constructed from optically clear, bio-compatible, and chemically resistant borosilicate glass or high-clarity polycarbonate, allowing immersion within the algae culture. The array of fins (40) is designed as a series of sealed, hollow tubes extending into the bioreactor medium. These tubes are filled with a secondary heat transfer fluid (e.g., glycol-water mixture) that circulates passively or is pumped (if active fluid circulation is needed, but the claim explicitly states "without a fan") to a heat exchanger external to the bioreactor. Heat generated by the LEDs (17) on the printed circuit board (50) passes through the receiver (95) to the main body (45) and then into these heat exchange fins, directly cooling the fixture within the culture medium without external fans. The light modules (M) provide specific spectral outputs (e.g., blue 450nm and red 660nm) optimized for algal photosynthesis. The power supply (25) in the rear receptacle (105) is hermetically sealed against the humid environment and bioreactor splashes.
flowchart TD
    A[Algae Reactor Environment]
    B[Biocompatible Housing/Lens]
    C[Light Engine (LEDs)]
    D[PCB]
    E[Receiver]
    F[Main Body]
    G[Hollow Tube Fins (Submerged)]
    H[Heat Transfer Fluid (Internal)]
    I[External Heat Exchanger]
    J[Power Supply]
    K[Rear Receptacle/Cover]

    C --> D
    D --> E
    E --> F
    F --> G
    G --> H
    H --> I
    J --> C
    J --> K
    K --> A
    B --> C
    B --> A
    I -- Heat Release --> A(Ambient Air)

Derivative 21.4: Integration with Emerging Tech - AI-Optimized Adaptive Photonic Control.

  • Enabling Description: The LED light fixture integrates AI for adaptive photonic control. Each optical lens (55) extending from the printed circuit board (50) is a tunable liquid crystal lens, capable of dynamically adjusting its focal length and beam angle. An embedded AI inference engine (e.g., a neural network model) running on a dedicated microcontroller within the power module (70) continuously processes inputs from ambient light sensors, presence detectors, and potentially video analytics (if external cameras are integrated). Based on these inputs, the AI optimizes the light fixture's output: it adjusts the brightness and color temperature of the LEDs (17) and dynamically controls the tunable liquid crystal lenses to shape the light beam. This optimization aims to achieve precise illumination targets (e.g., lux levels, uniformity) while minimizing energy consumption. Data logs of AI-driven adjustments, energy consumption, and environmental parameters are recorded on a blockchain for verifiable operational history and energy auditing. The fan-less heat dissipation ensures silent operation critical for sensor-rich environments.
graph TD
    A[Environmental Sensors] --> B(AI Inference Engine)
    C[Presence Detector] --> B
    D[Video Analytics] --> B
    B -- Control Signals --> E[Power Supply (Adjustable)]
    B -- Control Signals --> F[Tunable Liquid Crystal Lenses]
    E --> G[LED Modules]
    G --> F
    F -- Optimized Light Output --> H[Illuminated Area]
    B -- Data Logging --> I(Blockchain for Auditing)

Derivative 21.5: The "Inverse" or Failure Mode - Photochromic Dimming for Glare Mitigation.

  • Enabling Description: The frontal lens (35) of the light fixture incorporates a photochromic material (e.g., spiropyran or spirooxazine dyes embedded in the polymer matrix) that reversibly darkens upon exposure to high ambient UV radiation or intense external light sources (e.g., direct sunlight). This inverse functionality acts as a passive, glare-mitigating mechanism, ensuring that the light fixture does not become an additional source of glare or uncomfortable brightness in excessively bright ambient conditions. The degree of darkening is proportional to the intensity of the external light stimulus. This feature passively protects human vision and prevents over-illumination, reducing unnecessary energy consumption by the LEDs (17) when ambient light is sufficient, without requiring active electronic control or fan operation. The heat dissipation by the fins (40) remains crucial for internal LED thermal management, as the photochromic layer itself may absorb some light energy.
stateDiagram
    state "Low Ambient Light (Transparent)" as Transparent
    state "High Ambient Light (Darkening)" as Darkening
    state "Max Ambient Light (Opaque)" as Opaque

    Transparent --> Darkening: UV/Light Exposure > Threshold
    Darkening --> Opaque: UV/Light Exposure further Increases
    Opaque --> Darkening: UV/Light Exposure Decreases
    Darkening --> Transparent: UV/Light Exposure < Threshold

Combination Prior Art Scenarios

These scenarios describe how the core concepts of US7651245, specifically its heat management, internal power supply, and LED+Zener module architecture, could be combined with existing open-source standards to create prior art.

  1. US7651245 + DALI (Digital Addressable Lighting Interface) Open Standard:

    • Description: The LED light fixture of US7651245 is integrated with the DALI open standard (IEC 62386) for digital lighting control. The internal power supply (25) within the receptacle (105) is a DALI-compliant LED driver, capable of receiving DALI commands for dimming, group addressing, and scene setting. The control interface (145) of the optional radio frequency control unit (135) or a dedicated DALI controller chip within the power module (70) allows the fixture to be seamlessly integrated into a DALI lighting network. The Zener diode (18) bypass for LED failures ensures that even if one LED fails, the DALI network can still control the remaining operational LEDs, and diagnostics (e.g., DALI fault reporting) can be implemented to report the specific module failure.
    • Prior Art Implication: This combination makes obvious any future claims related to DALI-controlled LED fixtures with internal, passively cooled power supplies and inherent LED failure bypass, especially in robust housings. The integration of standard digital lighting control with the disclosed thermal management and reliability features would be a straightforward engineering adaptation.

  2. US7651245 + Open-Source Heat Sink Design Principles (e.g., from academic papers, industry best practices):

    • Description: The housing (20) with its fins (40) and main body (45) acts as a passive heat sink. Combining the thermal management strategies of US7651245 (e.g., thermal pad 61, void 125, insulator 110, varied fin lengths 40a, 40b, 40c) with widely published open-source heat sink design principles, such as optimization for natural convection (e.g., fin spacing, height, and orientation based on Rayleigh number calculations), surface emissivity enhancement (e.g., black anodization), or transient thermal analysis methodologies (e.g., finite element analysis using open-source tools like OpenFOAM). This defines a broad spectrum of passively cooled LED fixtures.
    • Prior Art Implication: Any claims related to specific passive heat sink geometries, materials, or internal thermal flow paths that primarily aim to dissipate LED and power supply heat within a rugged, internal-power-supply LED fixture would be rendered obvious. The patent's existing thermal features, when explicitly combined with general heat transfer engineering knowledge and open-source design practices, would cover numerous structural variations.

  3. US7651245 + Open-Source IIoT (Industrial Internet of Things) Protocols (e.g., MQTT, OPC UA):

    • Description: The LED light fixture (10) of US7651245 is augmented with an embedded processor (e.g., a Raspberry Pi Zero W or an ESP32) within the power module's box (30), communicating via Wi-Fi or Ethernet. This processor runs an open-source client for an Industrial IoT protocol like MQTT (Message Queuing Telemetry Transport) or OPC UA (Open Platform Communications Unified Architecture). The fixture continuously publishes telemetry data (e.g., LED junction temperature, power supply temperature, light output intensity, power consumption, Zener diode bypass activation status) to an MQTT broker or an OPC UA server. It can also subscribe to control topics for remote on/off, dimming, or diagnostic requests. The rugged housing and internal power supply make it suitable for harsh industrial environments where IIoT monitoring is highly beneficial.
    • Prior Art Implication: This combination would make obvious any claims related to remote monitoring, control, or data logging of passively cooled, internal-power-supply LED fixtures in industrial settings using standard, open-source IIoT communication protocols. The addition of standard connectivity and data reporting to an already robust lighting solution is a logical and straightforward integration.

Generated 5/15/2026, 12:47:03 AM