The droop in the article is not about the sag in lumens from a poorly heat-sinked Lux. CFL has efficiency of 100 lm/watt, LED is 250, but only at low power levels. Crank up the power, and the efficiency droops to only 100. The article reviews current research into this. They say that LED should be capable of 300. So, a 7 watt LED at 300 lm/watt will give the same light as a 100 watt incan, as opposed to the 23 watts required by CFL. I found the article to be quite interesting.