I went the cheap way I guess (500 seems way too much) I changed all my bulbs to the bright white bulbs. I realize not as good as HID's but I like 'em. As far as brightness, I had to drop the 130 watt bulbs down to 85 watts, I use them daily as driving lights with my headlights. They match and are plenty bright enough. I did point them down because without it, somebody would be driving around with a bald spot in the back of their head.
