I'll bring this thread back to life. I figured I would post up a couple opinions here.
I had originally made my roof rack lightbar on a tight budget. I used 4 55W Blazer Baja tractor lights. These were cheapies, a mere $30 a pair. So, I essentially have 220 W on the roof rack. The light output was certainly disappointing, but it did it's job. The light from the roof helps a bunch on dark and wet or snow covered roads and trails. The light seems to bounce less off the reflective surfaces, which provides for a seemingly brighter road. They also cut down a good deal on pothole shadows.
Working on a higher budget, I was able to be a little more picky when purchasing grille lights. After reading reviews, I finally chose a pair of Hella Rallye 4000 Cornering beams. While the pair cost nearly $250, the light beam is incredible. The beam is probably 140 degrees wide, yet the horizontal cut off is perfectly at the centerline. I can drive around with them on, and never get flashed by oncoming vehicles. The amount of light is amazing too. They seem at least twice as bright as my low beams, and I can easily see more with ONLY them on, as opposed to my low beams.
I was previously under the impression that all lights were essentially the same. Boy I was wrong. The higher priced Hellas are certainly worth the added cost if you have the budget.
Here's the compulsory lights-on pose picture.
I'll certainly reccommend the Hella 4000s, especially the cornering beam pattern. I'm now shopping around for replacements for the roof lights. I've got to bring them up to par with the Hellas!