This is always the biggest mistake about HID lights. People think that because they are brighter that they are hotter. The fact is that HIDS run much cooler than halogen. If your stock bulbs cant melt the housing your HIDs cant.
I have had mine for about a year now and have had no problems.
some will say 55watt racing hid kits wont melt anything but the 55 watt racing hid kits do run hotter than stock. i just dont see the need for 55watt on the streets when you can just aim the 35watt higher hehe