kung pang h4 housing yung projector mo, swak yung d2s bulb. stock d2h bulbs are good for only a few hundred hours of use. laki ng difference ng 35 to 55 watts. but you need a better bulb. morimoto bulbs are good enough. but if you have extra cash go for philips 85122+. I have some extra pair of 55watts ballasts still bnew. pm me if you're interested.