As pointed out in the comments, the original 500 LED video light panels prices have been reduced since it's first inception. Of course, it's because the new style 600, 900, and 1200 LED panels are out. For the new lower prices you could almost get two 500's as opposed to one 600 LED light panel. The older 500 LED panels are still great lights to use, but they do weigh a bit more than the newer 600 LED panel and also don't offer a battery mount. Two different versions of these 500's are available with a true Dimmer knob, and one dimmable through 4 power switches.

Dimmable Knob 500 LED Light Panel

500 LED light Panel 4 Bank