I have HID's in my Dakota and the extra light they provide is a bonus as I drive a remote highway late at night when I go back and forth to work. They put out more light than a halogen bulb but they should only be used with a projector lens designed for HID's.
I had to retrofit projector lenses into a new set of aftermarket headlight housings so that I wouldn't be one of those doosh's I hate....you know, the guy rocking purple HID's in his '95 cavalier with a plywood wing that blinds all the oncoming traffic regardless of hi or low beams.
Lots of people think using HID's gives them more light because they are that much better. In most cases that seems true because those people put HID bulbs in an OEM housing with a reflector designed for a halogen bulb. The light scatters way more and the cut off line becomes almost non existent. They have more light output but it's at the expense of the safety of drivers coming towards them.
My HID's do put out more light but it's not as drastic of an improvement as I expected. And remember, the lower the number of the bulb the more "useable" light you get. ie. purple 12,000K bulbs suck in the dark when compared to "yellow" 3500K bulbs.
I can't speak for LED's as I haven't researched them at all but I would think they would need a specific reflector/projector as well.
'84 CJ-7: Yota axles (spartan locked front, e-locked rear) 4" BDS, 1" Daystar & 3/8" shackle lifts, 35" X-Terrains on steelies, YJ Tub & family roll bar, heater blower upgrade, 4.2L w/MC2100 & Team Rush, Warn 8274. Rebuilt 4.2/4.0 hybrid, AX15 and twin sticks/clocking ring waiting to go in.
The advertised position for a topless, dirty jeep girl has been filled......by my wife. Thanks to all that applied.
<------------and yes, that is her. :-D