Andoer 4 in 1 Socket Adapter Holder E27 Bulb Socket Light Lamp Splitter for Photo Video Film Studio Photography Studio Softbox Accessories 4in1 adapter to installed 4 bulbs in 1 single socket. Fits for studio E27 lamp. It allows you to operate 4 light bulbs at the same time, convenient for you to adjust the brightness according to your needs. Each socket can support for max 300W, which means it supports for max 1200W in total. Average diameter of the bulbs should be less than 80mm.