I wanted to contribute here and do a test of some LED lights. I'll share the photos here and provide some subjective observations.
Mounted LED units on a 1x6. Where I had a pair of the same type I wired them together. Mounted them symmetrically like you would if they were mounted on the truck. Powered them selectively with a fused DC cord connected to the truck battery.
Set the lights on top of a storage + portable bench, at approx. the same height as the stock headlights. I did not take a lot of time in aiming the LED lights.
Picture taking was done from behind the container looking down the center line of the lights, with a digital SLR mounted on a tripod, and set manually to retain the same exposure setting for each shot.
Found an empty dark road I knew of, with a slight uphill, and curve ahead of the lights. It was snowing on & off that night.
The lights are :
BlitzPro 3LR, 12W each
BlitzPro Hawk 15S, 36W
ADVMonster Model 30 Spot, 10.2W each
ADVMonster Model 60 Wide Beam , 28W each
BlitzPro Model 6LZ, 18W each
Quick comparison results:
The BlitzPro 3LR is noticeably brighter than the 6LZ. I personally like the form factor of the slender rectangular 6LZ versus the round 3LR though for the application I intend to use out the back of the truck off the canopy.
The BlitzPro Hawk 15s (shorter cousin to the popular 21S), produced a large cone of light that could reach up into the trees higher than the ADV Monster Model 60. The two Model 60s were brighter than the 15S out in front of the truck, as you would expect comparing 56Watts to 36Watts, but the 15S had a broader beam.
The Model 30 Spots could reach further than the Model 60, but obviously at less brightness. Careful aiming of these lights would be necessary to maximize their use.
Looking back at the truck from a distance of over 100m (330feet) the LED lights were definitely more intense than the headlights, but its hard to compete with the overall distance you could see with the Hi-beam headlights. To be fair, the headlights are not stock bulbs but PIAA Extreme White units that I've been very happy with on highway travel.
The light pattern comparisons were taken shining against a rockface, 10m (30-35ft) away.
Camera settings were 18mm lens at f4.0 for 1 second for the distance shots, and the pattern shots against the rock face were done with 18mm at f5.6 at 0.5 second exposure.