I just became aware of the new-ish Adorama Flashpoint Streaklight units. Streaklights are a shoe-mounted electronic flash "system" that starts with a bare-bulb flashtube, and then adds different reflector options, like a small, stippled silver "standard" reflector, and also the option to fit other reflectors, a beauty dish and grid, and a diffusion dome. I guess the Streaklights are somewhat like the Q-flash,but much less expensive. The Streaklights can be powered by a high-performance optional lithium battery pack, and can use Lumedyne and Quantum accessories. The Streaklights look to me like they would be very good flash units for off-camera umbrella and main and fill light use. The $299, 180 Watt-second model looks like a very good value to me. This video shows the big brother 360 Watt-second model. I kinda' want one of these, now that I know they exist!