I just bought a Bosch 7" round H4 lens and a 35/35W 9003 bulb. As far as I know they are plug and play but we will see. My thinking is the 35W draw on the anemic 550 charging system is less than the stock 40W/50W OEM bulb but the actual light output will be the same or better. Any thoughts?
BTW I don't ride after dark much the headlight is more for being seen than anything else.