LEDs can be as bright as HID and require no warmup time, but the housing and projector needs to be designed for LED bulbs. You can't stick an LED bulb in a HID or halogen housing and expect good output. And there are not really any aftermarket LED projectors that would easy or cheap to retrofit.
I ended up using a set of cleared ebay halogen projector headlights and doing a true HID retrofit with the mini H1s that Konvict mentioned:
https://www.theretrofitsource.com/c...ftermarket/bi-xenon-morimoto-mini-h1-7-0.html
I had to remove the whole projector assembly from the housing, make a backplate, and seal the whole thing back up. I also used Morimoto 55w ballasts and 4500k bulbs.
Here's a few shots of my build and the output: