I get that the sun is huge energy source, but it is so far, and the light from bulbs is just as bright as the sun
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It’s because of wavelength. Not all light carries enough energy to be absorbed by your skin.
In incandescent (old filament style) lights, you”ll find that not only will they warm your skin. They’ll burn it much easier than sunlight will.
This is because there is no filtering of light that takes place. They release both light and heat, or photons that have variable wavelengths producing some that have enough energy to be absorbed by your skin, heating it; While others do not have that same energy and create only light as they scatter off of it.
LEDs and modern lighting are tuned to *only* produce photons of the wavelengths of scattering.
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