I agree, they are more expensive and don't seem to last any longer than incandescent. Maybe they save energy but the disposal issue is a PITA and heaven forbid if you break one. I hate 'em!
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I use a small heat wrap like those available at Northern Brewer or B3 or Rebel Brewer and wrap the fermenter with reflective insulation (like that you use for a water heater) with a thermo well and digital temp controller. Works well, even down to 38 degrees and uses very little energy.
I've definitely looked into and am interested in this technique but issue is you can only do this with one fermenter unless you have more than one thermo well and dig temp controller. I'm usually doing 10 gal batches in two fermenters minimum, so that'd be at least two of everything. Plus sometimes i'm fermenting and carbonating and want higher temp.