Posted by Bob M on January 06, 2013 at 11:51:28 from (67.240.174.32):
In Reply to: Question for John T posted by Russ from MN on January 06, 2013 at 10:07:31:
Quoting Removed, click Modern View to see
The lamp and the heater will be almost equally efficient as space heaters.
Reason: The luminous efficacy of a 100 watt incandescent bulb is about 3%. This means 97% of the wattage going into the lamp is "wasted" as heat. Further, if the bulb is located inside an enclosure so no light escapes (like in a pump house), the 3% of the input wattage converted to light is reconverted to heat when it is absorbed inside the enclosure, which further warms the enclosure contents. In this case the lamp and the heater will be equally efficient.
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