The "HID look" bulbs do not look like HIDs. All they do is a very poor job of immitating the "look of HIDs" by changing the color of the light output. By changing the color, you lose the intensity of the light(meaning it's not as bright), so many of the manufacturers make up for the loss in brightness by increasing the wattage of the bulb. Anything above 80W(100W are popular) will eventually burn out your wiring. I've even seen cases where 80W bulbs have burnt the wiring or blackend it.
About 2 years ago, I bought a pair of HID-blue bulbs for my M3 that I used for about 2 days and stopped using because the light output sucked dong and it really DID NOT look like HIDs. The worst $80 I ever spent. I still have these and if anybody wants them, I'll give it to you for a great deal. FREE!! Just pay for the shipping.
I can't remember it for the life of me, but there was this great website that explained a lot about bulbs and what it really meant when it said 55W=80W. Very good reading, but I have no idea what the site is. Maybe someone here might remember.