You are correct that different colored LEDs
generate different amounts of heat, but perhaps
not for the reason you might expect.
Heat in most cases is generated through
inefficient energy conversion. Most of the
heat comes not from the color of light itself,
but from the inefficiency of the device making the
light. In LEDs, this inefficiency is generally
because of defects in the materials, and
scientists are continuing to improve these
materials and their performance.
As with anything, devices also tend to
generate more heat when they produce high
intensity light. For a given color, a
brighter LED will generate more heat because more
electrical current is passing through the
device, and any inefficiency will become
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