Dropping an HID bulb in a halogen housing is bad news, and there is no way to do it correctly with the same reflectors.
LEDs can work great, when done correctly. Don't dismiss them on principle. Some are garbage, and some are awesome. I bought a set of cheap ones for the fog lights in my Celica a couple years ago, and I loved them so much, that I bought the exact same ones for the low beams on my '04 Outback. The ones I got are bluer than I'd like (6500k), but not crazy obnoxious.
Step one is to make sure your headlight lenses are clear. Mine were very cloudy, so I started with a restoration (I wet-sanded, and sealed with some thinned urethane), which helped immensely. And then I swapped the LEDs in.
Because of the design of the bulb itself, it was a bit tough to get it in the housing and locked down correctly, but it fit fine. And unlike many LED upgrades, these have a flexible braided heat sink that can be molded to the housing shape so you don't have to cut or drill a hole behind the bulb for the heat sink.
Beam pattern is great, I've had them for almost a year and a half now, and I've never had anyone flash their highbeams at me. I've been followed by this car in traffic in my XT6 and my Celica, and did not find the headlights obnoxious at all.
20170106_194211 by Numbchux, on Flickr
On my Outback, the low beam bulb is illuminated with a reduced voltage as the daytime running light. This would make the LEDs flicker, so I disabled the DRLs, this was easy on my car, but I don't know about yours.
I don't know if it's something about the LEDs, or just the color, but the light from the LEDs doesn't seem to travel as far down the road, so I'm not a fan of using them on the high beams.
LEDs use considerably less electricity, and should last longer. Of course, there's much more to go wrong, power converters, and sometime even cooling fans, so they do still fail.
One downside to be aware of, is they don't generate much heat, so there can be an issue with icing in the right (wrong) conditions. But honestly, it's not too bad.
Edited by Numbchux, 12 April 2018 - 02:04 PM.