The SP300B produces a superb warm light that will bathe your subjects in soft light. These are very high quality professional strobes that will give you years of service. They are perfect for commercial studios, location photographers as well as advanced amateurs. You can use this strobe for a main light, fill light, back light, or hair light. With the variable power setting you will have complete control over your light output. It is perfect for film or digital cameras.SPECIFICATIONS:Power Input : AC110-130 volt, 60 HzFlash Power : 300ws (joule) in fullGuide No. : 183ft/56m ISO100Color Temperature : 5300K - 6500KFlash-tube Lifetime : over 10,000 typical flashingPower Setting : 1/8 to full continuouslyRecharge Time : 1.5 seconds in fullFlashing Duration : 1/600 sec. @t=0.1; 1/1000 sec. @t=0.5Modeling Power : Halogen 150wSync Voltage : 6 voltFuse : 5AWeight : 7 Lb (3.175kg)Triggering : Sync Cord / Test Button / Wireless Remote / Inductor Will work with Bowen Speed Rings.