Things that Glow Cold> Many objects glow with light <#5376,19><!energy>. Most are also hot. But a few glowing objects are not so hot. They give off light energy without giving off much heat.
Glow-in-the-dark toys and jewelry give off a dim light without being hot at all. A fluorescent light bulb, like a hot glowing light bulb, changes electrical energy into light <#5376,19><!energy>. But it doesn’t get very hot, so it wastes less energy in the form of heat.
Some animals can also “glow cold” (without giving off much heat energy). Angler fish live in a pitch dark world. No sun. No light bulbs. Like many deep sea animals, they use chemicals to create their own light. A “fishing rod” on the angler fish’s head has a glowing light. The light attracts prey and mates.
Fireflies glow on and off, over and over. Like angler fish, they use chemicals to create light energy. And I’d bet they’re very thankful they don’t need to get as hot as a lightbulb to do it!
