Bulb fits into holder,small ballast box sits neatly to the side and then you spread out heat sinks and cap screws on. Have had my hand on back of cap after lights been on for a while and doesn't feel warm.
Ive tryed the philips extreem 130% bulbs..they are bright. But still dont give that nice chrisp white light. Ive used a 5000k hid on my old bmw bike and that was nice and bright.. I could use it again on the rr but not happy about cutting the light cap . Will buy one of them let and see how it is.. Im more after being noticed with a bright light.
eBay LED bulbs are impressive for the price. clear crisp light compared to standard bulbs, I used them on my trip to Misano GP last year and they worked perfectly infact the other riders I was with said when they looked in there mirrors my bike was the one that stood out, I've even fitted them to my Van