When presented the task of picking a flashlight, you will find many types to choose from. Don't let this be an overwhelming task, start with somthing small and cheap.
Picking the right flashlight that fits your needs is important to any dumpster diver.
Most professional dumpster diver's will pick a smaller light that's easy to carry, yet bright with a small beam of light so as not to be noticed at night.
The last thing a dumpster diver wants is to have the dumpster lit up like an airport, so keep it small.