http://www.dvdhometheateronline.com/lamp-hours/
How much energy (in kWh) does a 100 watt lamp use if it is on for 12 hours?
How much energy is it in joules and in Btus?
i got 1608570 Joules and 1524.7 BTU
A 100 watt lamp consumes 100 watt hours per hour, or 1200 watt hours in 12 hours, or 1.2 kwh in 12 hours.
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