[Mark Suszko] “At least consider adding a diffuser and a short arm to offset it by a foot or two.”
Great idea. If you have to be mobile and keep the light on the camera, you may want to visit your local professional-photographer store, and try to rig your video camera like a wedding photographer rigs her flash — off to one side and above the eyeline/lens. Use one of those offset brackets that attach either to the baseplate or the hot shoe. It might be a bit ungainly but your advisors here are right about the look being much better with a little bit of offset.
One caution, though. I haven’t actually tried what I just suggested, and if you are shooting handheld in an active situation, it may be a bit weird to have the offset light. If you are just trying for “fill” light, an on-camera light might actually be subtler and better.
I’ve used a light mounted right on top of the camera plenty of times (including yesterday) and it can work as a subtle fill. Yesterday I had to deal with a very “toppy” convention hall, and a little bit of on-camera light helped take the curse off some very hot noses. It also allows you to make the foreground person pop out of her environment, by using a diffused and filtered-warm on-camera light, and balancing for the background.
Try the wedding-photographer bracket and that little light you found.
Bob C