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Comparison of efficiency by wattage (120 Volt lamps)Power (W) Output (lm) Efficiency (lm/W)40 500 12.565 1000 15.070 1100 15.7
"It is not the wax that burns (generates energy) but the wick. The wax is more of a moderator to ensure it does not burn too fast."Nonsense, just for a start there were oil lamps with asbestos wicks.
What is 12.6 lumens in watts?
It is not the wax that burns (generates energy) but the wick. The wax is more of a moderator to ensure it does not burn too fast.
QuoteIt is not the wax that burns (generates energy) but the wick. The wax is more of a moderator to ensure it does not burn too fast.Where did you get that idea from?
Quote from: Karen W. on 20/01/2008 21:31:44What is 12.6 lumens in watts?A lumen is a measure of perceived light falling on a given area.Wattage is a measure of power. In the calculation above, I looked at the amount of power required to generate the given amount of light using an incandescent light bulb radiating equally in all directions. This makes assumptions about the inefficiencies of the incandescent light bulb (even with incandescent bulbs, higher rated bulbs were more efficient at emitting light for a given unit of power). A different assumption for those inefficiencies (e.g. if one assumed a compact fluorescent light bulb, rather than an incandescent light bulb, and the correlation would be different).Another assumption here is with the way that the human eye absorbs light (since it is perceived light intensity that is measured), so the amount of light for a given wattage would be perceived differently for different species of animal (and may even be slightly different for different individual human beings).Another way of looking at the power is by looking at the power actually contained in light (this is often quoted for sunlight, since this figure is used to look at the potential power available for solar energy converters, but the figures are not usually adapted for human perception, which is not evenly distributed across the spectrum).
When the average candle burns, how does one calculate how much heat energy it is producing per weight of wax, and what is the equivalent light output, in watts, from an electric lightbulb?Chris
Hmm, having recently bought a solar powered robot, I was wondering (what with it being winter) whether it would be possible to use the photons from a candle to power the robot. The instructions suggest a 50W halogen bulb can be used on cloudy/wintry days, but I was going to try candles instead (plus some mirrors) instead.What do you reckon as to my chance of success?