Sorry, forgot to update this thread that I started...
I started this thread by asking what is the correct size bulb for the
Spyder Projection headlights. The reason I had to ask this is because when I ordered the Spyder headlights back in 2008, they sent me H1 HID bulbs to use in the headlights, but these went bad after a few years. I called Spyder company and they sent me more H1 HID bulbs.
So I was all set for quite a while.
Then, in June, I had those bulbs from Spyder go out on me, and when I called Spyder again, they told me they don't sell or even recommend putting HID bulbs in their projection headlights.
I was like "what"? I ordered H1 HID bulbs from them in the past. Obviously, they have new staff and they don't have a clue what they are selling.
So, I figured I would just order new H1 HID bulbs from another reputable company and some on here recommended Diode Dynamics. I placed the order with them, and they sent me the incorrect bulbs. I have no idea why they did this. They sent H3 HID bulbs, which is not what I ordered, and due to the base on the bulb, these will not work.
I called them and they sent me H1 HID bulbs which I plugged into the projectors, and have been using them since July. I have had no problems with these bulbs. They seem so much brighter than all the previous bulbs I have used in these projectors and I have not had them flicker on me or not light up.
I am not sure what all the others responses were about, like trimming the back of the projector. I just plugged in the H1 bulbs and they worked. They light output is amazing compared with the stock halogen headlights.
Also, there is some saying that there are special HID bulbs now being made for the Spyder Projectors. Maybe the newer style projectors are made different than the older projectors which I have.