Quote Originally Posted by saxman
yes, but they're reflectors designed for hid bulbs... they are designed to reflect the light as hid's out put it. Using an hid bulb in a halogen designed housing is no where near comparable. It would be FAR FAR FAR more difficult to retrofit an entire reflector designed hid set up than projector.
but all light reflects in the same manner, regardless of spectrum.
some of the plug and play jobs i have seen have been extremely effective.
as far as retro fitting projectors its a question cost/effort for benefit.