I'm not Dan but this is snipped from what he posted on Monday. The Jeep JK Wrangler headlamps will fit, for example, but they aren't worth messing with if you want to see well at night.
You can have replaceable-bulb halogens (the best ones are made in Japan by Koito);
you can have BiXenons (Hella);
you can have LEDs (JW Speaker; Truck-Lite, Peterson).
The best LEDs are the J.W. Speaker units in chrome or black. Less-expensive and still quite good are the Truck-Lite and Peterson units. The fun part: all these LED headlamps I've linked are made in America!
For 7" round I personally have been using Hella, US Standard SAE lamps (now called Vision Plus), but upgraded with Narva Rangepower bulbs bought from Dan years ago. I bought those lamps because I was unhappy with Hella's DOT Motorcycle lamps. The isoplot Dan shared helps explain why, although I didn't see those until many years later.
All in all probably still a decent option for the price keeping in mind bulb choices have changed.
Driving in the woods with winding roads a lot, I decided it was worth hunting down a set of Z-beams. They are no longer made so don't bother looking unless you thats really what you want.
