Agreed. I might be coming across as a purist, but E-Code reflectors that are H4 based are a minimum for a halfway decent HID retrofit.
The Headlight FAQ (faqlight.carpassion.info) has this wonderful guide on bulbs and their success rate based on HID conversions.
http://faqlight.carpassion.info/special-topics.htm
According to this, a 9007 retrofit will be far less successful. It will work, but not as well as an H4 retrofit.
This is why I personally recommend that IF anyone attempts an HID retrofit using any reflector based technology, they use E-Code H4 reflectors and HID bulbs based for H4's.
A good H4 HID retrofit bulb (should come with shielding), combined with an ECE reflector (shielded as well) will prevent stray light from hitting oncoming traffic.
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by kodiakz:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">So you think the stock housings are going to be less effective as a reflector with these HID bulbs </div></BLOCKQUOTE>
Absolutely!! I have customers with both and the difference is quite noticable. </div></BLOCKQUOTE>