Any ideas why this would happen.
Circular fluorescent light starter socket.
A newer rapid start fixture has a ballast that supplies extra power when turned on so the light comes on immediately.
If the tube is circular simply unsnap it from the brackets.
For some reason the starter socket not the starter itself had become very brittle.
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This circular fluorescent light fitting i have is around 4 5 years old.
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Circular t5 2gx13 t9 t10 fluorescent lampholders from a a g.
A circular fluorescent differs from a straight tube only in shape.
To remove a straight fluorescent tube rotate it a quarter turn in either direction and pull the tube straight down out of the sockets.
An old delayed start fluorescent flickers a few times before coming on as the starter delivers a burst of energy to get the tube going.