Tunable LED Spectral Correction for Blackbody Locus Lighting

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Solution Overview

Problem

Conventional LED lighting systems fail to accurately replicate the full spectrum of sunlight, leading to misalignment with the blackbody locus and inadequate circadian rhythm synchronization.

Innovation Solution

A tunable lighting system incorporating a first and second LED with a correction circuit, including a correction LED, to produce light that follows the blackbody locus and matches circadian rhythms, utilizing a capacitor, diodes, and microprocessor control for precise spectral output adjustment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If conventional LED lighting systems are used, then energy efficiency and product lifetime are improved, but spectral accuracy and alignment with blackbody locus deteriorate

Engineering Contradiction:

Improveenergy efficiencyVSAvoidspectral accuracy

Core Design Contradiction:

Use of energy by moving objectVSManufacturing precision

Solution Approach 1:

The patent combines multiple LED types (warm white LED, cool white LED, and correction LEDs with specific wavelengths) into a single integrated lighting system. This merging allows the system to maintain the energy efficiency of LEDs while achieving spectral accuracy by combining their individual emissions to reconstruct the full blackbody spectrum

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies local quality by introducing specific correction LEDs with targeted wavelengths (cyan, yellow-green, orange) to address specific spectral deficiencies in conventional LED lighting. Each correction LED targets a particular region of the spectrum to ensure accurate color rendering at different color temperatures

Inventive Principle:

Principle #3Local quality

2Device complexity

If conventional LED lighting systems are used, then device simplicity is improved, but circadian rhythm synchronization deteriorates

Engineering Contradiction:

Improvesystem simplicityVSAvoidcircadian rhythm synchronization

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent implements dynamic control of LED intensities based on the desired color temperature. The system dynamically adjusts the contribution of each LED type (warm white, cool white, and correction LEDs) to maintain accurate spectral output across the tuning range, ensuring proper circadian rhythm synchronization at all operating points

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent incorporates feedback mechanisms through microprocessor control that monitors and adjusts the intensity of each LED based on the target color temperature and blackbody locus requirements. This feedback ensures accurate circadian rhythm synchronization by maintaining proper spectral content

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If LED output is tuned to different color temperatures, then adaptability is improved, but spectral accuracy deteriorates

Engineering Contradiction:

Improvecolor temperature tuningVSAvoidspectral accuracy

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent utilizes parameter changes by varying the intensity ratios of different LED types to achieve color temperature tuning while maintaining spectral accuracy. By changing the relative contributions of warm white, cool white, and correction LEDs, the system can tune across color temperatures while staying on the blackbody locus

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces correction LEDs as intermediary elements that mediate between the warm white and cool white LED emissions. These correction LEDs with specific wavelengths (cyan, yellow-green, orange) act as intermediaries to fill spectral gaps and ensure accurate color rendering during color temperature transitions

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system achieves accurate color rendering and circadian rhythm matching by aligning LED output with the blackbody curve, enhancing human health and productivity through synchronized light exposure.

Implementation Method 1

The correction circuit includes a correction LED that produces light

Methodology Applied

Scientific EffectLight Emitting Diode: Light Emitting Diode

Implementation Method 2

utilizing a capacitor, diodes, and microprocessor control for precise spectral output adjustment

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 3

utilizing a capacitor, diodes, and microprocessor control for precise spectral output adjustment

Methodology Applied

Scientific EffectDiode: Diode

Data Source

PatentUS12513798B2Systems and methods for tunable LED lighting

Publication Date: 2025.12.30 3LED INC

AI summary

A tunable lighting system includes a first LED having a first spectral output, a second LED having a second spectral output, and a correction circuit including a correction LED. The correction circuit in the tunable lighting system controls the correction LED to emit light that, when combined with light output from the first LED and light output from the second LED, produces a selected spectral characteristic.