Jorkest said:
mirrors are very powerful...they bounce LIGHT
It's a common misconception that mirrors are good reflectors, scientifically speaking anyway.
Household mirrors only reflect about 12% of the light that makes contact with their surface.
Mirrors are very poor reflectors of light energy. A flat-white painted wall will return 80% of visible light. And incidentally mylar, being a good reflector of multiple spectrums of light energy; mylar ideally will bounce back 90-95% of total light energy that makes contact with its surface.