Fovitec StudioPRO SDX-400 Photography Studio Monolight, Professional Studio Strobe Flash Lighting Head 400 Watts/s The StudioPRO SDX-400 Monolight series is a excellent professional strobe light for your photography studio. This series features replaceable flash tubes, which ensure great longevity and many photographs with this light. The six stop range (from 1/32 to full power) allows for optimal lighting control with adjustments in increments of 1/10th of a stop. This light is top of it's class with a fast recycling time of 2 seconds or less at full power. The all aluminum body is built strong as well as being a light weight material. Fan cooling assures that the inner electrical components stay at the optimum working temperature.