Summary
This paper presents a cost-effective colorimeter-based closed-loop feedback controller for tunable LED lighting systems that maintains spectral accuracy despite LED aging and temperature drift. For circadian lighting applications, this approach enables reliable, long-term delivery of target spectra without expensive spectrometers, making precision spectral control more feasible in real-world deployments.
Key Findings
- Relative spectral error kept below 10% using a cost-effective colorimeter as the feedback element
- Color differences between target and emitted spectra maintained below Δu'v' < 0.002, indicating very high color fidelity
- Open-loop approaches produce unacceptable spectral and color inaccuracies due to LED aging and junction temperature variation
Categories
The Science of Light: Demonstrates feedback control methods for multichannel LED systems to maintain spectral accuracy, directly relevant to circadian lighting standards and melanopic EDI delivery.
Author(s)
A Llenas, J Carreras
Publication Year
2019
Number of Citations
4
Related Publications
The Science of Light
- Phototransduction by retinal ganglion cells that set the circadian clock
- Color appearance models
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Melanopsin is required for non-image-forming photic responses in blind mice