These heat resistant porcelain lampholders are suitable for all incandescent bulbs, ceramic heat emitters and UV spot lamps (i.e. Osram Vitalux, Zoo Med PowerSun) with E27 socket.
To attach a power cord to the lampholder you have to unscrew the base.
For doing so you have to push down the retention pin inside the lampholder (e.g with a screwdriver) and unscrew the upper ring.
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