top | item 34960163 (no title) fitzroy | 3 years ago Aren't traditional (non-LED) lightbulbs that get hot much higher in the IR spectrum since they're dissipating most of their energy as heat? discuss order hn newest Zak|3 years ago Bright visible light causes the pupil to constrict and triggers an instinct to squint, blink, or look away. IR alone does not.
Zak|3 years ago Bright visible light causes the pupil to constrict and triggers an instinct to squint, blink, or look away. IR alone does not.
Zak|3 years ago