The 61-V600-3FCW is a Kit offering 600 watt-seconds of variable power with a compact wheeled carrying case, light stands, and umbrellas.
What sets the FC kits apart is that all of the three flash heads included with the kit are top of the line 2103-FC Convertible Heads. These fan-cooled heads have a built in adapter ring that will accept either the #2034 (16 inch) or the 2032 (6-1/2 inch) reflectors AND a large number of soft boxes and other light modifiers from many manufacturers.
The fan-cooled user replaceable flash plug-in flash tubes are rated at 1500 watt-secs. This flash head is standard with a 250 watt, glass encapsulated quartz halogen modeling lamp.
The Powerpack is Digital Compatible. Sync voltage is 6 Volts, as required for Electronic and Digital Cameras.