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.
Might be a lower wattage. I deal with Beamers HID's here, and I have had many a conversation with them about HID bulbs in Spyder type projectors. They have seen a lot of melted and burnt housings, along with very poor light output.