Two is better than one. That is, get a light that has 2 built in lamps. When one blows, you still have the other. Turn on both for maximum power. You can choose to turn on only one lamp, which is sufficient for my regular wedding and event videography with a Sony camcorder.
There are 2 versions. One powered by the L series batteries and the other by the M series batteries. Choose the M series battery type as it is the newer version and has built in power indicator.
I just purchased another set of video light yesterday. Anyway it is compatible with my future Sony HDR-FX1.