If you have to carry stuff by air LED flashlights are more than terrific!
I bought this one
to autofocus in the dark and it can do light painting on a long exposure. But this one
works well, though when sweeping the foreground you have to be quick as the beam is a little too bright.
There is a good tutorial at Kelby Training here
I find LED light a little on the cool side, and have to do a local white balance correction, but that is about all.
As a side note, the beam from these flashlights is quite narrow compared to the big generic flashlights you can buy at any hardware or motoring shop, and so you have to work faster to get an even spread of light. From that point of view those larger flashlights have an advantage.