This paper suggests the driving circuits of constant voltage, square wave, triangle wave, sine wave DC current control method for LED array adopted optimal heat sink design. The efficacy of LED bulb with all driving circuits showed more than 70% and...
This paper suggests the driving circuits of constant voltage, square wave, triangle wave, sine wave DC current control method for LED array adopted optimal heat sink design. The efficacy of LED bulb with all driving circuits showed more than 70% and 20 lm/W. In case of applying prototype LED bulb as a recessed downlight fixture, LED bulb showed high efficiency of 90% because of LED"s directivity despite low optical output and luminous efficacy than CFL. Consequently, we confirm that LED bulb can be apply to the practical use..