A little weak but great for light painting as it can even cast light. The heat filter also comes in handy if you want your shots to have a golden tint. I really don't like the button to open and close the battery compartment. It's tiny, rubs off and gets stuck. It's also difficult to find a knob to control the intensity, and at night when you really need this thing you'll have to slog through to find it. However, it does the job.