Thats correct, The heat build up is the killer for most lamps.
Although the CFL runs cooler the end part with the electronics still gets quite hot.
If the heat can't dissipate properly it reduces lamplife and risk of fire.
Check with specs of the CFL lamp.
For incandescent lamps the Watt output is directly related to heat, so if a 100 W lamp is inserted in a 60 W max. fitting, the lamp will have a short life, the wiring will fry behind the fitting and there is an additional fire hazard created.
The product of rotation, excitation and flux produces electricty.