Photo: A typical energy-saving compact fluorescent lamp (CFL). How compact fluorescent lamps (CFLs) work To touch, so don't try it! In fact, an incandescent bulb wastes aboutĩ0 percent of the electricity it uses by getting hot.įind out more in our article on incandescent lamps. Incandescent lamp, you'll know it gets incredibly hot-far too hot If you've ever put your hand near a typical If making light is our only objective, any heat we make is The wire filament in a lamp all give off light, but they also give You might think heating up a bit of wire is a pretty inefficient See our article on light for a fuller explanation of how atoms make light. Rid of, the photon appears as light of a particular color. Get rid of some energy and do so by giving off a tiny packet But this makes them unstable, so they quickly return to The electrons inside the atoms push out farther from the nucleus to soak up thisĮxtra energy. The atoms inside it absorb the heat energy you supply. Light-but why should it give off light at all? When you heat iron, Hot iron looks red, yellow, or white because it is giving off But this short exposure photo makes it clear exactly what's happening. It's hard to see this normally since you can't look at a lamp for very long without it hurting (or even damaging) your eyes. Photo: An incandescent lamp makes light when the filament gets white hot. The filament in a lightbulb looks white because Gets hotter still, say about 2500☌ (4500☏) it will glow with aīright, white light. Rises to about 1100☌ (2000☏), the bar glows yellow. (1750☏) this is what we mean by "red hot." If the temperature Put an iron bar in aįire and it will glow red when the temperature reaches about 950☌ Orange, yellow, or white because they are hot. The thin wire, called aįilament, gets extremely hot when electricity flows through it. With a very thin piece of wire inside it. A typical electric light bulb comprised a glass globe This means they give off lightīecause they are hot. Traditionally, most lamps were incandescent. Need to understand what's so bad about ordinary ones. To understand what's so good about energy-saving lamps, we first Why ordinary (incandescent) lamps waste energy How much do energy-saving lamps actually save?.How can you compare the efficiency of different kinds of lamps?.What's inside a compact fluorescent lamp?.How compact fluorescent lamps (CFLs) work.Why ordinary (incandescent) lamps waste energy.
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