This article is from the Toyota Tundra FAQ, by Steve Yee with numerous contributions by others.
Some owners wish to replace their lights with a HID (High Intensity Discharge)
Xenon kit. True HID kits will require you to rewire your headlamps but can use
the existing reflector assembly.
Two companies produce HID kits for the H4 series bulbs. One word of warning :
You may lose your high beams. (Lexus, Mercedes, and other manufacturers that
use HID bulbs mix a standard halogen bulb for high beams in their reflector
American Products Company sells a true HID system that uses the stock assembly
with a H4 type mounting. The website is at http://www.4apc.net/HID.htm.
American Products Company does not sell direct to the public. The H4 kit from
APC can be purchased for $799 from Street Beat in Phoenix. Their phone number
A website called HIDLights.com also is selling (and they are on a clearance
sale) their H4 kit for $825. You can reach them at www.hidlights.com.
A Canadian company has begun to sell true HID High/Low beam conversion kits.
The cost for the H4 system is $1329. The website is at