Quote:
Originally Posted by kev2809
I didn't use any reflector...I did have to re aim the headlights but that's it.
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The reflector is the dish in the headlamp housing.
LED is a directional light source. It lacks the semi spherical scatter that tungsten filament bulbs provide.
There are 921 series LED bulbs that are purposely engineered to soften and scatter a ring of light against the reflector dish in a filament housing. This setup does seem to work fairly well with the early discontinued Phillips Vision bulbs that I used in place of the 921 push in base backup lamps on my Tundra and my Impala SS. The difference is very noticeable. I have yet to find a replacement for these Phillips bulbs that works as well.
I have yet to see an LED replacement lamp for the larger taillamp/turnsignal and headlamp bulbs that does the same thing as the original Phillips Vision 921 design.
LED bulbs with side mounted LED chips are likely a lot less expensive to produce. The side mounted design provides several point sources against the reflector instead of the original Vision 921 that effectively scatters the light against the reflector of the vehicle lamp housing by directing the light against a metallized coating on the tip back against a conical reflector to scatter it out all 360° of the the sides similar to the bulk of the light from a Tungsten filament bulb.
The below side blasting bulbs are what are on the market now. The headlamp bulbs are similar to the three sided bulb on the left. The light from bulbs like these have hot areas where the light is focused from the LED chips and dark areas between the chips.
