Brooke, I second Mike's advice. I tape the LED and battery together first with clear packing tape Then I tape that to the disc with clear duct tape AT ROOM TEMPERATURE. I've never had a light fall off yet with this method. If you buy the batteries (2025 or 2032) and LEDs (2.3V-3V) in bulk online the cost per disc can get as low as $1.50.
Brooke, I second Mike's advice. I tape the LED and battery together first with clear packing tape Then I tape that to the disc with clear duct tape AT ROOM TEMPERATURE. I've never had a light fall off yet with this method. If you buy the batteries (2025 or 2032) and LEDs (2.3V-3V) in bulk online the cost per disc can get as low as $1.50.