#1 The wires for the LEDs are made of copper-coated aluminum and are very thin. #2 LED drivers are custom crap and mine were wired backwards and had bad solder joints. #3 drivers really get the LEDs working. Upper limit. The LED module board was in a 68°F room at 120°F after 20 minutes. Also, the sound of the speakers is very tinny, they have to be in an etching chamber to work properly. I made one out of 2" polystyrene which also helps keep the speakers free. Insulation if installed in the attic. I also extended the LED wires to place the drivers outside of the attic in case If the driver fails, I don't have to drive to the attic. Purchase at your own risk.
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