For an even, controllable light source for shooting video and still shots, one option is the high quality Ice Light for $450. It uses flicker-free LEDs and a lithium ion battery. The other option is to make your own, using Justin Barr's clear and simple instructions for about $30. Anything that involves PVC is worth doing.
Below is a look at how the DIY light shines on a subject, on what he says is his "unimpressed" wife. (We are impressed with his creation!)