I run 3 LED lights over a 4x8 table. At 100% power my temps would easily rise to 100⁰f if I let it. Even at 60% they still kick in my AC at 85⁰f every few minutes. But to get the same coverage with HID, I would need 2x 1000w bulbs or 3x 600w bulbs. The power usage would be considerably higher...