TECHNIQUES FOR LUMEN MAINTENANCE AND COLOR SHIFT COMPENSATION
First Claim
1. A lighting assembly, comprising:
- a diffusible light source to illuminate an area by providing light output, wherein the provided light output is measured in lumens;
a photo detector configured to measure lumen output of the diffusible light source and a golden sample light beam; and
a directed light source to provide the golden sample light beam, wherein the golden sample light beam is used to calibrate the photo detector.
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Accused Products
Abstract
Techniques are disclosed for maintaining consistent lumen output of a lighting assembly over time. By maintaining a consistent lumen output, it is possible to maintain acceptable color stability where color mixing of multiple outputs is used. The lighting assembly may be any lighting configuration that might suffer from lumen depreciation and/or color drift over time, and may include any type(s) of light source(s) that may be monitored and driven accordingly. The lighting assembly, in addition to light source(s), includes a photo detector and a directed light source, such as a laser. The directed light source provides a golden sample for use in calibrating the photo detector, which in turn monitors lumen output of the light source(s). Drive signals are adjusted to account for lumen depreciation of the monitored light source(s).
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Citations
7 Claims
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1. A lighting assembly, comprising:
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a diffusible light source to illuminate an area by providing light output, wherein the provided light output is measured in lumens; a photo detector configured to measure lumen output of the diffusible light source and a golden sample light beam; and a directed light source to provide the golden sample light beam, wherein the golden sample light beam is used to calibrate the photo detector. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification