Lighting Control System Spectral Power Distribution Adjustment

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Solution Overview

Problem

Existing lighting control systems cannot adjust the perceived appearance of objects under different spectral content changes without altering the chromaticity of the light output, and are not generic across different light fixtures.

Innovation Solution

A lighting control system that includes a controller, driver circuits, and a user interface, which allows users to input desired lighting effects, generating a target spectrum to produce a second light output with the same chromaticity but altered spectral power distribution, approximating the target spectrum, thereby controlling the appearance of objects without changing the chromaticity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the spectral content of the light output is adjusted to alter the appearance of objects, then the lighting effect control is improved, but the chromaticity of the light output changes

Engineering Contradiction:

Improvelighting effect controlVSAvoidchromaticity of light output

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The system changes the spectral power distribution parameters of the light output while maintaining the chromaticity parameters constant. By adjusting the intensity of specific wavelength bands within the visible spectrum, the system alters how objects appear under the light without changing the overall color temperature or chromaticity coordinates of the light source itself.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The light output is segmented into multiple spectral bands or wavelength ranges, each controlled independently. This allows selective adjustment of spectral content in different regions of the spectrum while maintaining the overall chromaticity balance, enabling precise control over object appearance without shifting the light's fundamental color characteristics.

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If the control method is specific to a given light fixture with specific light sources, then the spectral content adjustment is achieved, but the applicability across different light fixtures is reduced

Engineering Contradiction:

Improvespectral content adjustment precisionVSAvoidapplicability across different light fixtures

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The control system is designed with universal applicability across different light fixture types and configurations. Rather than being hardwired to specific LED modules or light sources, the system uses a generalized spectral control approach that can adapt to various fixture architectures, enabling the same control methodology to be applied across diverse lighting hardware platforms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system employs adjustable spectral targets and flexible control parameters that can be configured for different light fixture types. By using parameter-based control rather than hardware-specific control, the system can adapt its spectral adjustment strategy to match the characteristics of different light sources while maintaining consistent control functionality across all fixture types.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If the output intensity values of individual light sources are adjusted to modify spectral content, then the spectral control is achieved, but the user lacks control over the perceived lighting effect on objects

Engineering Contradiction:

Improvespectral content controlVSAvoidperceived lighting effect information

Core Design Contradiction:

Manufacturing precisionVSLoss of information

Solution Approach 1:

The system incorporates feedback mechanisms that allow users to observe and control the perceived lighting effects on objects. By monitoring how objects appear under the adjusted light and providing user feedback loops, the system enables direct control over the visual outcome rather than merely adjusting spectral parameters in isolation. This closes the gap between spectral adjustment and perceived effect control.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system introduces an intermediary layer between spectral adjustment and object illumination that translates spectral changes into predicted or measured visual effects. This intermediary processing layer allows users to control the perceived lighting effect by providing a mapping between spectral parameters and visual outcomes, enabling intuitive control over how objects appear without requiring deep spectral knowledge.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11849519B2Systems, methods, and devices for influencing spectral content of a light output

Publication Date: 2023.12.19 ELECTRONIC THEATRE CONTROLS INC

AI summary

A method for control of a light fixture, the method including energizing the light fixture to produce a first light output with a first chromaticity and a first spectral power distribution, receiving a user input representative of a desired adjustment of a lighting effect, generating a target spectrum based on the user input, and energizing the light fixture to produce a second light output with the first chromaticity and a second spectral power distribution. The second power distribution approximates the target spectrum.