If you are looking for something more powerful and versatile than a camera flash you could try a monolight. These are self-contained electronic flash systems that are useful for sports and fashion photography along with other special lighting occasions. They are self-contained, portable systems that are ideal for location work.
A monolight has a connection to an electrical power source on one end and an electronic flash tube and modeling lamp on the other. In between, it has the power conversion and lighting controls. The flash tube surrounds an incandescent modeling light that is used to judge lighting effects and ratios before you take the shot. Monolights have multiple f-stop controls and modeling light settings. Most of them come with built-in slave sensors so they all fire in sync.
Modeling lamps are as low as $10 while complete moonlight kits can cost over $5,000.