I’ve heard that red light helps you sleep better. Is there some special technology that causes the light emitted to be red or is it just a regular lightbulb apparatus encased in red glass?

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I’ve heard that red light helps you sleep better. Is there some special technology that causes the light emitted to be red or is it just a regular lightbulb apparatus encased in red glass?

In: Physics

I don’t know any info about improving sleep, but to clarify, there’s not really a difference between a red light and light put through a red filter (red glass). The red glass only allows light of wavelength red through, and white light has all colors.

That’s weird. When I do rotations in a firehouse it’s a overhead red light that wakes you up when there’s a call. There’s also obviously noises, but now I wonder why red was chosen.

Red light doesn’t help you sleep better. Non-red, and especially blue light makes you sleep worse. No light is still better than red light. It is because your body uses blue light as a way of recognizing sunlight, since firelight is typically more red.
In terms of ways of making red light…
Short answer to second question: On a practical level, all red light is the same
Long answer: There are many ways to make red light – some involve putting white light through a filter (which is wasteful since you are just throwing away all of the blue and green light), while others involve making it directly (such as LEDs or neon lamps). This property is part of why LEDs and the like are more efficient than incandescent bulbs.
Typically, red light that is made directly, as opposed to filtered white light, is of only one frequency. Practically speaking, this doesn’t matter. It just means that if you put it through a different colored filter, you’ll get a lot less light.