On Sep 5, 9:07*am, "ian field" wrote:
I have a 4 pin 2D light in the bathroom that flickers for a steadily
increasing length of time before starting and shimmers badly when it does
eventually start.

The local electrical retailer only has 2pin types, which I assume has a
built in starter.

My question is - can I use a 2pin tube in a 4pin fitting, but not the other
way round?

Thanks.

I never heard of a 2D light. Are you referring to the bulb or the
entire fixture, what wattage, circular or straight, details are needed.