Demetron Demi is supposed to use something called Periodic Level Shifting (PLS) from 1100 to 1300 mW/cm squared. I have no idea what the means or what advantage that confers. Can somebody explain that? Also according to Kerr, the light only requires 5 seconds for a true cure. That is really fast. Right now I cure for 20 seconds in 2-3mm resin increments. The handle also looks smaller than most of the other curing units and it looks like it will be easier to handle. Is anybody using this and would you recommend it?