An HPS system is capable at peak to achieve 140lumens per watt,(Usually a fair amount less then that) a CFLs is 90 but it's lumen per watt range doesn't vary as much. Of course heat is simply the current flowing in the bulb so watts represents heat. So is what your trying to say is that a CFLs light is not worth reflecting, but an HPS bulb is? People reflect HPS often because if you can get back even say 5% of the light on a system that powerful then you've added a lot. CFLs are of course much weaker generally speaking but if the room is properly ventilated then I don't see a reason a reflector would be bad. That being said CFLs are so cheap these days I rather just buy a couple extra bulbs. I actually like this guys reflector, though I think he should add a few cumputer fans to the sides and I'd seriously make sure those bulb sockets can handle those amps.

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Usually high and randomly browsing threads so don't expect a reply beyond my original post as I've most likely forgotten I ever posted.