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Old 12-26-2010, 04:42 PM   #9 (permalink)
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Either way, your light bulb is working mostly as a heater and to answer your question directly, a 100 watt light bulb will put out roughly 2.5 times as much heat as the 40 watt bulb.
If you go with a hotter bulb you might think about getting a thermostat as well as insulating, that way you don't cook the crabs.
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