Jůhannes Gunnarsson asked:
How many watts is a burning candle?
We had an answer on our forum from Bored Chemist. He assured us the original standard candle will burn a waxy substance called spermaceti. Itís called that because it comes from sperm whales. The best that we have today is, of course, petroleum based wax. Weíve got to compare for that. But the standard candle, he says, would burn 120 grains of spermaceti an hour. Thatís 8g.
The reason it isnít as bright as an 80W light bulb is because itís really inefficient. Most of that 80W is actually given out as heat. So itís not like the energy efficient lightbulbs. Most of the stuff coming off candles is heat with only 0.05% of it, not very much at all, coming out as light.