Over the years I have posted this information many times on PFF, but it's scattered around and hard to find. I've started this thread in an attempt to conslidate it all in one place. Feel free to PM me if you find other fragments I've previously posted that you think it would be useful for me to repeat here.

N.B. All of the wall photos were shot under identical conditions at the DOT-standard aiming distance of 25 feet, so they should be directly comparable. The cross-shaped mark on the wall is an aiming point that is compliant with DOT standards.

Baseline low beam for comparison ... the Fiero's OEM Delco H6054 headlight, a rectangular 65/35 watt (h/l) halogen sealed beam (this particular headlight has quite a few hours on it, and it is aimed too high):




Hella H79567/H6054 (rectangular) conversion headlight with standard 60/55 watt H4 halogen bulb (ECE compliant):




Hella 90mm (round) low beam module, 65 watt H9 halogen (DOT compliant):




Hella 90mm (round) high beam module, 65 watt H9 halogen (aimed too high) (DOT compliant):




Finally, the very expensive Hella 90mm (round) HID low beam module, D2S HID capsule (DOT/ECE compliant):




Some people want to wire their quad headlight system so that the low beam stays on even when the high beam is selected. This is an essential modification if you are running HID (rather than halogen) low beams. Here's how to do it:

Simple solution: Just add a single wire jumper. You could even insert a simple SPST switch in the jumper if you wanted to be able to switch between standard "two light" high beam mode and "four light" high beam mode. This circuit does double the current (amperage) through the headlight switch/circuit breaker when high beams are selected, so it may not be adequate for all conversions:




Better solution: Please remember that all the discussion concerning the adequacy of the stock Fiero headlight circuitry still applies. I don't think that the stock headlight switch will survive the current demands of four 65 watt H9 bulbs ... at least not for very long. Adding a relay would be a better solution, IMHO:




I'll add more information here as time allows. Check back occasionally.

[This message has been edited by Marvin McInnis (edited 05-29-2012).]

AWESOME!