Rps Studio Light Bar Rs-3100 Features The heavy duty LightBar is designed to accept up to 4 speedlites and, if desired, wireless releases, LED lights or quartz lights. It features metal construction with a tilting umbrella holder. The umbrella holder has a saw-tooth design for the tilt feature assuring a secure positioning of the bar. It attaches to a 3/8� or 5/8�light stand. It can also be attached to a tripod via an included reversible spigot with 1/4-20 or 3/8� female threads. The LightBar is available in two versions. The RS-3100 has 4, 1/4-20 screw thread posts and the RS-3102 has 4 insultated, locking accessory shoes which accept even the Nikon SB900 and Canon 580 EX II speedlite.