Fotodiox Pro H-600A Studio Monolight with S-Mount Bayonet 7" Reflector - 600 Watt Second (600 W-s) Studio Strobe 600 Watt-Second (w/s) Strobe, 5600k Daylight Balanced Flash, Guide Number 250 (ISO 100) The aluminum cover and equipped induced draft cooling system keeps the body light and at a normal temperature to prolongs the life of the monolight The modeling lamp can be turned on or off separately from the strobe and can be dimmed separately or synchronously with the strobe Fully compatible with all Fotodiox professional accessories as well as most Bowens and Calumet 'S'-Mount accessories such as; reflectors, barn door, snoots, beauty dishes and softboxes Flash intensity can be controlled via the power dial and the strobe uses plug-in strobe tubes for easy replacement