Is T4 a PL tube?

[stocker]

Is the 4 pin PL also called T4?

[vinz]

No. T4 is not a PL but an FL. T4 is a code to indicate the thickness of the FL tubes.

[stocker]

Thanks vinz.

But I recall having seen a "T4 PL" printed on what looks like a PL tube, (connections on one end only). Maybe I saw wrongly...

[tawauboy]

quite possible just a product code.
not related to thickness of fl tubes (t12, t8,....)

[bclee]

T4 is a straight FL tube. Not a common size.

As Vinz has said T-4 is refered to FL tube with 4/8" (0.5in) diameter.

(T-n refers to FL tubes with n/8" in diameter.)

Sometimes there is reference to a T-4 base. This usually means a screw-thread base with 0.5in diameter.

BC