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Gday Lewis
What type of strap is it???
If it is a simple resistor string, or nichrome wire, it wont hurt anything, it will just put out a lot less heat.
Ie many dew "controllers" use PWM to effectively reduce the operating voltage as required to control the heating power out.
Ohms law gives V = I x R
and power out P = V x I
Mixing these 2 you can get P = V^2 / R
Thus at 12V you get 144/R watts
and at 9V you get 81/R watts
so about 56% of what you would get at 12V
Andrew
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