what is lamp holder? A lamp socket for securing a lamp to its support; specifically, a socket or holder fitted with electric terminals, into which the top of the glass globe of an incandescent lamp is fitted, or from which it hangs.
A porcelain light socket is a common ceiling fixture for lightbulbs due to the heat-absorbing properties of the material. In a recessed lighting fixture, the ceramic socket hangs above a glass lens, typically circular or rectangular. Removing the lens provides access to the fixture for replacement.
Since you will likely need a ladder to reach the fixture, recruit a helper to help hold the ladder steady while you work.
James supply the lamp holders, bulb holders, E27 lamp holder and GU10 lamp holder 30 years!
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