In reply to The Lemming:
if you decide to buy something not made for photography / video, make sure you test it properly before you use it in anger.
i tried a couple of generic LED lights previously and they either weren't white to the camera or they used some sort of scanning light pattern and made the image look truly terrible.
there's a few from the likes of neweer and manfrotto that might be worth looking at though, or just a portable halogen work light from screw fix