The Porcelain light socket is a cost effective way to utilize a wide variety of E26, E27, E40, GU10, MR16, R7S based lamps. The simple household lamps as well as outdoor lighting and LED bulbs. This highly versatile product has an adjustable metal mount with a 5/8" receiver for light stands and an 8mm receptacle. Porcelain light socket (lamp holder) includes E12 Candelabra, E27 lamp holder, E26 Medium (standard), E39 Mogul, E40 light socket and GU-24 size sockets. Porcelain light fixture are more heat resistant, and typically last much longer, than regular phenolic (black plastic) lamp sockets especially in applications where heat or limited air circulation may be an issue. Examples of these applications may include pendant lights and lamp and fixtures with downward facing light bulbs.