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Yup, it's due to the fact that we perceive green as much brighter.

It's actually very interesting to look at "constant luminance color wheels" which correct for this perceptually:

https://www.researchgate.net/profile/Ralph_Redden/publicatio...

https://i.stack.imgur.com/f4n0P.png

What we traditionally call "yellow" isn't even present, it becomes more like "khaki" or "olive".

On hot summer days I set my LED lights to 100% green. The idea is that I get more perceptual brightness per unit of heat released into the house. On days like that I am still getting light through the window, even if it is filtered by a space blanket, and I am mainly looking at screens, so there is still plenty of red and blue light around.

You may want to measure the actual power usage and light output of your LED lights. Typically, green LEDs are less efficient than blue or red, which may cancel out the perceptual differences.

Why do you do that, does it have a health benefit?

To reduce the heat that the bulbs are putting out, I think? Though, LED bulbs are already very efficient, and the difference in power usage between green light and a perceptibly the same brightness normal warm or sky tone light is probably minimal.

> I get more perceptual brightness per unit of heat released into the house

I don't see any red in this either

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