Why old light bulbs are really heaters

Why old light bulbs are really heaters

An old light bulb is a heater that happens to glow.

It heats a thin wire to about 2,700 K, and a glow that hot is mostly invisible infrared. Only about 5% of it is light you can see. An LED skips the hot wire, so the same 800 lumens takes about 9 watts instead of 60.

Send it to whoever still has one in a lamp.

#lightbulb #LED #physics #howitworks