the.com/luminescence
light without heat, the universe's way of glowing instead of burning.
means The emission of light by a substance through means other than heat — chemical reactions, biological processes, or absorbed energy released as a cool glow.
from From Latin 'lumen' (light) — the same root behind 'illuminate' and 'luminous' — fitted with the suffix '-escence,' which marks a process of becoming (as in 'effervescence' or 'phosphorescence'). The word was coined by physicist Eilhard Wiedemann in the late 19th century to name precisely this: light that is not the red-hot glow of incandescence, but light born some other, cooler way.
cold lightemits photons without thermal radiation, unlike a bulb
deep seamost deep-ocean creatures produce their own light
glowing forestssome fungi shine to lure spore-spreading insects
firefly efficiencyconverts nearly all energy to light, almost no waste heat
named speciesradium's eerie glow once decorated watch dials