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My problem with the comparison is that it is an unfair comparison. OK, efficiency to me may mean something differently to others, but having spent two decades designing switching power supplies, I chased efficiency.
LEDs are nothing more than current to luminance converters.
Incandecents are basically resistors.
CFLs are voltage devices - ionizing is a potential function.
The converter for the CFL is not designed to function in this setup. There isn't enough storage capacitance in the circuit. That makes it look much worse. I don't have any love lost for CFLs - I dislike them extremely.
However, this setup had the incandesent at a similar intensity to the CFL.
BTW, incandecents make fantastic loads. I was testing a current sensing circuit and the best way I could test various loads was to use incandecents. I found a string of garden incandecents at 11w per bulb and I was able to reliably test down to 5 bulbs in series (11/5 w) as well as 40/60/75/100 as standard bulbs.
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