There are several lighting options, but what works best for me is a portable (which really isn't meant to be portable) track lighting system. I will be taking three two foot track sections with gooseneck lights purchased from one of those major home improvement retailers. Why two foot sections you might ask? Portability! I can take these apart versus trying to bring a 6 foot track in the back of a SUV.
To get the tracks back together, I use connectors and put covers over them. I also have it wired to an electrical cord at the end.
This is what the finished track looks like when it's hung and lit. I've attached it to a cross bar above the top front of the booth (this picture is from a different show) with cable ties. The gooseneck pendant lamps are adjustable, so I can pose them to shine light exactly where I want them too.
You can't have too much lighting!