This adapter allows user to hook up 3 light bulbs to one socket at same time. Better focusing effect and cooling effect make it widely used in photography. our socket adapter also used in home lighting. You can install this socket adapter to your only socket and get 4 E26/E27 lamp sockets easily. For instance, your garage, basement, attic or storeroom may be dim sometime for there is only one socket. Transforming your room to brightness. Caution: Make sure your fixture can handle the weight of this lamp socket and 4 bulbs Specification: Base type: standard E27 base. Support power: 75Wx4 (300W in total).