<---the link mentioned is most likely Dan's
Quote The Headlight guru
"Adding a lightsource that is not intended for your headlamp or any optical device is a poor choice. Putting HID, LED, neon, whathaveyou in a optical system not intended for these systems will not perform as intended. An HID lightsource produces a light arc vs. the straight filament in halogen and incondesent light sources. A round peg in a square hole.
Putting a much higher output lightsource in place of another will create glare problems as the optics of the headlamp will not be able to cope with the increased light output. Headlamp development is a very complicated process. There is a reason that headlamp laws are by far the greatest and most complete of all the automotive requirements. Check out FMVSS and see how much bigger 108 requirements (headlamps) are to the others.
Higher K temps will make your headlamps appear
brighter. Not actually produce more light.
For performance, use a standard boring 9007 (HB5) bulb. No tint, no fancy packaging, no highwattage, no bulb over $15, no BS. Add relays or larger wires per Dan's site for maximum performance.
Dont forget to reaim your headlamps after suspension changes, adding a heavy stereo, etc."