The Robert Juliat 310H is a single lens luminaire featuring a 200 mm Pebble lens and powered by a 1000/1200 W Tungsten source with G22 socket. It delivers a beam range of 8° to 63° with light output of up to 30,000 lumens at 3200K color temperature. The fixture includes double colour runners, a unique rotating barn door with 4 individually rotating blades, and rear focus adjustment that can be operated when the unit is hot. Constructed from strong sheet metal with black housing, it weighs 8.7 kg and measures 46.5 × 35.0 × 44.0 cm. Designed for easy maintenance with front access to lamp housing, it features convection cooling, an earthed safety grid, and safety cable attachment point.