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Message: <blockquote data-quote="Taxman" data-source="post: 16553" data-attributes="member: 985">That's a problem when your light source doesn't geometrically match the reflector design specs. If the lamp was designed to have all the light coming from one small hot wire filament, ditching that and replacing it with 30 LEDs positioned all over is going to ruin the focus. It's a problem with HID conversion bulbs, and I've got to assume it's a much bigger problem with an LED array that looks like I stuck emitters all over my thumb.Here's an article Daniel Stern wrote about the subject many years ago:http://www.danielsternlighting.com/tech/bulbs/Hid/conversions/conversions.html</blockquote>