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Hi Gary,
Some resistors in series to make up 1-2w output should work well to keep the dew off most nights I say.
Say like 4 - 1/2 watt 27 ohm resistors should get you around 1.3w or 4 at 22 ohm which shall give you around 1.7 watts.
Just solder them in series...ie: end to end like sausages ..lol
Should work well I say.
My 6" has only 1 watt of heating and it has never fogged up and you cannot feel any heat by touching the stalk or side of the mirror.
cheers Gary
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