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I'm a big fan of LEDs, and I especially like the stuff that Rigid Industries uses! It has a mil-spec/aerospace quality to it and nicely integrates fin-type heat sinks. On top of that it has a thermal control circuit that will auto-attenuate power based on thermal threshold. That makes them small but dense. When off, and especially when covered, they are fairly inconspicuous. Their warranty seems liberal, and their support is responsive (I asked questions by email).

For my setup I went with two pairs of Duallys (4 of the 2x2 housings) and a 10" e-Series bar. The bar and one set of the Duallys are the flood variety. The other pair is a spot configuration. All units feature 3W Osram & Cree LEDs.

(they formed a union last April if interested)
http://www.ledsmagazine.com/news/8/4/1

Anyhow, I just bought a new set of bumpers with their placement in mind. For the front, I went "Body Armor 4x4" (because I wanted their optional skid plate). The Dually floods are mounted low and on the bumper ends, canted out 15 degrees. The 10" e-Series bar is mounted a bit higher on the winch plate mount (custom bracket). The last set of spots will go on the bull bar, center-mounted (need to wire those in still).

Since I ditched the factory bumper and fogs, I decided to mount all of the flood lights with the factory harness. It works great! Total draw is a bit less than 5 amps (about 1 amp each for the individual units and a big more than 2 amps for the bar). The 20 degree flood pattern produces a great field of light, but you can only use them off-road -- or treat them like high-beams. They will blind oncoming traffic!

I considered a large top-mount bar but went this route instead. If you go with the 20" combo, I'd like to hear how it works out for you. I'm sure you'll be happy.
 

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I swapped out my spot Duallys and bought some D2s. These spots are mounted on my bull bar. The difference in light with six LEDs (only two more 3W LEDs per housing) is substantial.

Final setup: Dually floods, e-Series 10" bar flood, and a pair of D2 spots. I ran the spots on a second circuit since they have to be covered when not off-road. If you don't have the same law, all could be run on the factory fog harness. Total draw for all five housings is well under 10 amps!

I'm taking them on a trial night run tomorrow. Big Bear's Cactus Flats to Yucca Valley's Pioneer Town and back.
 

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Just a note on the D2's... If I were you, you might want to look at the D2's in the driving beam. They have great usable light... JMO
You're right, the D2 spots setup as a driving beam are wonderful. I just got back from 11 hours of driving; the night run was awesome!

My D2s are center-mounted on my bull bar just higher than the headlamps. With the LEDs on, the headlamps contribute very little. I'm impressed. This really changes my feelings about running trails in the late afternoon. We always hustle to be off the trail by sunset. Now, I'll be doing more night runs!
 
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