HVC-30H is a constant current led driver , designed for LED lamp like street light highbay light, with low harmonic (< 10%), high power factor(>0.95). Output current can be flexibly adjusted according to the led lamp voltage. Off-line programming dimming, built-in surge protection, input under voltage, over voltage protection, output short-circuit, over voltage , over temperature protection that greatly improve the safety and reliability of the product.(The rated input voltage is 200-277Vac, half power derating<180Vac) Version: A-Adjustable potentiometer version P-Off-line programming dimming version