There's been some talk in the past about which one is better and the fact that there were some people that said the AB's had significant colourcast differences between high and low power. Well, I found a bit of info where someone did a head to head comparison with some pretty interesting results. The bottom line is that yes, the AB's do have a colourcast, but the difference between 1/16th and full power is about 50 degrees K... no big deal to anyone except the most stringent professioanal. Also, there are other measurable differences between the two that finally (in my mind, at least) edge out a winner. If you are considering between the Alien Bee 400s or the Elinchrome D-lite 2s, the Alien Bees can no longer be so easily discounted. http://www.alienbees.com/compare.html Now since this was done by AB, one may think there is the possibility of some discrimination. On that point, I leave that decision for you to decide after reading. Enjoy!