I've been running a DDM tuning kit in my Insight for several years now. Recently I was curious about LEDs and purchased an H1 kit to stick in my H1 projectors. Turns out the LED "bulbs" are too big around and don't fit into the projectors. When I have an actual failure, I might look for the smallest diameter LED bulbs and drill out the projectors a bit to make them fit, but until then I'm sticking with my 35w HIDs.
Good to know about the low efficiency of the ballasts, that's something I've wondered. Light output is significantly better though, so I'm not complaining.
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