If you have unfortunately broken your E40 Ceramic Lamp Socket on your lighting reflector, don't panic you can replace it with one of these to save buying a new reflector.
A live and neutral slot is on the E40 Ceramic Lamp Socket and the earth wire should be connected directly to your HID reflector.
If in doubt consult a qualified electrician.
These E40 Ceramic Lamp Holders can also be used to light up 125w or 250w compact fluorescent lamps. As CFL's have integral ballasts fitted, you can simply wire a plug and an E40 socket together to supply the power to your CF lamps, great for DIY grow rooms that want to use compact fluorescent lighting.