The optical and electrical parameters of AC-LEDs driven by AC and DC source were tested at different alternating-current voltage, frequency and heat-sink temperature respectively. It is found that the values of luminous flux, optical power and luminous efficacy of device driven by DC source are larger than those by AC-source in the same active power. Because of thermal effects, efficiency droop and equivalent series resistances, the luminous efficacy of AC-LEDs firstly increases and then decreases with the active power increases. By changing the temperature of heat sink, the infcuence of temperatures on peak wavelength, optical power and luminous efficacy of AC-LEDs were further discussed.