What’s the difference between a 500, 1000, and 1500 W Red Light Therapy Panel?

The difference is the effect the Red Light Therapy gives. The higher the power from the lamp, the more health benefits, compared to the same amount of time with a lower powered lamp. Lower power demands a longer treatment time. A good rule of thumb is that a 500 W lamp requires twice as much treatment time as a 1000 W lamp for the same effect.