YES this is correct for CFL???s but it has to do with HEAT. ie in an enclosed fixture or a ceiling recessed fixture the HEAT has no place to go except UP which is ???contained??? this VERY rapidly kills the bulb (as in MONTHS) so you need to properly VENT the fixture so the heat has an easy path OUT and away from the bulb itself. for Glass Enclosures this is hard but for Hat Lights its not so hard