This paper describes the thermal and light output performance variations forssome representative compact fluorescent fixtures. Experimental data isspresented showing the changes in relative light output and temperature forsboth screw-in and dedicated compact fluorescent fixtures systems. Initialsexperimental data shows that substantial losses in fixture efficiency can occursin compact fluorescent fixtures due to elevated temperature conditions insidesthe lamp compartment. These elevated temperatures affect the minimumslamp wall temperature of the compact fluorescent lamp and thescorresponding light output and efficacy characteristics of the lamp ballastssystem. This paper also presents experimental data on various methods tosreduce compartment and lamp wall temperatures in order to increase fixturesefficiency.