disclosed are novel ac - powered led light engines for solid state lighting able to achieve a high pf and a low thd without a traditional pfc . getting rid of bulky , and costly magnetic components , short - life electrolytic capacitor , and emi - causing fast switching , the disclosed ac - powered led light engines ushers in a cost - effective , and energy - efficient led driver design while eliminating the short - life electrolytic capacitor in an led driver and reducing the total cost of ownership . thanks to no bulky components , the disclosed ac - powered led light engines in a discrete or an integrated circuit form could be applied to the increasingly popular driver - on - board design . aside from being triac - dimmable via legacy phase - cut dimmers , the disclosed led light engines could also be made pwm -, analog -, or rheostat - dimmable with the incorporation of an appropriate dimming circuit to modulate the average led current , adding more flexibility and versatility to dimming applications .