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Searching for led lens optics, found this - interesting stuff! I know very little actual terms, but when I modded my 6" off road lights I noticed that the beam pattern would change with how far in or out the bulb was in the housing. Granted they are HID bulbs, so there is no real "beam pattern", I decided to mount them 1/2" out of the reflector to spread the center spot a bit.
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