BS EN IEC 62442-3:2018 Energy performance of lamp controlgear Controlgear for tungsten-halogen lamps and LED light sources. Method of measurement to determine the efficiency of controlgear - European Standards
LEDs Beware! The Rebirth of the Incandescent Light Bulb - Tech Briefs
Halogen lamps, explained by RP Photonics Encyclopedia; operation temperature, halogen cycle, luminous efficacy, energy efficiency
Energy efficiency of a quartz tungsten halogen lamp: Experimental and numerical approach - ScienceDirect