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It might get a little warm for the mirror unless you don't have too much direct contact.
You really only want to bring the temperature up just past the dew point or at ambient.
I use these heaters in my home brew as well and they can warm your 25ltr brew about 10 to 15 degrees above ambient but this takes time to do.
These will work, you will just have to play with the amount of direct contact with the back of your mirror to keep it dew free without too much heat.
Try it out.
Regards Matt
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