High-power light-emitting diode (LED) efficiencies strongly depend on device type and operating conditions. Measurements of input power, luminous flux and CIE colour coordinates are performed on commercial phosphor-white and red-green-blue (RGB) LED types selected from three manufacturers. Experimental results allow for a comparative efficacy evaluation of both LED technologies for making white light. Two approaches are used for this comparison, i.e. at constant 300 K junction temperature and for a fixed commercial heat sink. In both approaches the luminous flux and colour coordinates of the RGB application are set equal to those of the respective phosphor-white LED.
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