Summary
Blue-light-excited white LEDs cause greater eye fatigue than violet-light-excited LEDs, including a sun-spectrum-mimicking variant, as measured by subjective ratings, blink rate, accommodation power, and critical flicker frequency. Lighting designers should consider switching from conventional blue-phosphor LEDs to violet-phosphor alternatives to reduce visual discomfort in prolonged task environments.
Key Findings
- Subjective eye fatigue was significantly worse under blue-light-excited LED (B-LED) compared to sun-mimicking violet LED (S-LED) and standard violet LED (V-LED).
- Objective measures (eyeblink rate and accommodation power) confirmed greater eye fatigue under B-LED compared to S-LED.
- Critical flicker frequency measurements supported that fatigue of eye muscles (accommodative fatigue) is the principal driver of subjective eye fatigue rather than other factors.
- Violet-light-excited white LEDs with sun-mimicking spectral distribution (S-LED) produced the least eye fatigue among conditions tested.
Categories
Eye Health & Vision: Directly investigates how spectral power distribution of white LEDs affects eye fatigue, comparing blue-excited vs. violet-excited phosphor LEDs.
The Science of Light: Examines spectral differences between B-LED and V-LED (including sun-mimicking S-LED) and their physiological effects on ocular accommodation and flicker response.
Author(s)
J Sugimoto, Y Akashi, Y Hiraga, M Inatani
Publication Year
2022
Number of Citations
2
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