Studio Light head. A light head with 20cm reflector (does not come with a bulb). Will fit onto any light stand with a spigot. They are fitted with heat resistant Edison Screw fit ceramic bulb holders that can be used for bulbs up to 660watts. Can be used with continuous bulbs or slave flash units. This unit is designed to take an umbrella and has an adjustable focus rod to allow the bulb to move in and out.