Professional Custom Lamp Holder Accessories Manufacturer

Old electrician here. We always called the porcelain lampholder with no pull chain or string a "keyless" fixture and the ones with a chain or string a "pull chain" fixture. A keyless fixture always had to be wired to a wall switch.

A E27 Keyless Porcelain Lamp Holder base socket removes the switches to power on the light directly at the bulb. These sockets are ideal for light switches and other lamp types including touch base lamps. Installing the socket is a task similar to a lot of other light sockets and can be performed without the use of an electrician.
 

Keyless lamp holders offer electrical connections to the lamp and help it inside the flood light fixtures,the usage of keyless lamp holder allows lights to become safely and conveniently replaced (re-lamp)in the end of life, or to transform power, color, lighting technology and so on, there are plenty of different standards for these keyless lamp holder, created by many standards bodies, some miniature lights have wire leads suitable for direct connection to wires, some reflector equipment and lighting have screw terminals for wire connections.

E27 keyless lamp holder:

The keyless lamp holder in national standard for screw lamp cap or bayonet lamp. Cap quality relates to energy-saving lamps of interchangeability and protection against electric shock and other security requirements, cap the size of unqualified easily lead to broke off from the lamp holder, lamp and electric shock risk.