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Old February 20th, 2008, 19:50   #21
mcguyver
 
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Join Date: Aug 2005
Location: Northern Alberta
Voltage. If you live in or near a major city, your voltage swing can be 10% . This is the maximum most utilities allow. This means your voltage could swing from 125 volts to about 112 volts. If you use incandescant lighting, this means a 10% drop in output from 125v to 112v. This drop in light output will translate into a drop in emitted IR as well.

Try a different type of light, like a halogen. They aren't as susceptible to voltage swings for emitted IR (if you've ever noticed how hot they get) as well as cycling at 60 Hz.
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