marty said:
Hummina Shadeeba said:
Wait can someone tell me this basic thing: isn’t all the electricity going into a bulb either turning to heat or light? If so I don’t see how an incandescent bulb would be inefficient at producing heat as I think the energy in the actual emitted light is very small.
Don't matter how ya cook it, a watt is a watt. 1500W heater makes the same amount of heat as 15, 100W light bulbs. Old style incandescent light bulbs that is.
Okay, the REAL story. Heat from any light source is thermal loss, same as heat from your electric bike is thermal loss. It is an inefficiency, only a pure accident that it also is useful in a cold house. Any light from a heat source is light loss, an inefficiency. More light, less heat.
A 1500w heater makes MUCH MORE heat than 10-100w lamps. How much more depends on the type of lamp. The old style incandescents would produce so much more heat and less light, which is why they are gone. Your car headlight produces I think as much light as a 60w incandescent would, but it's not as hot. Because it creates the light on lower wattage and doesn't waste as much on heat.