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Lighting Nomenclature??

Hello everyone.  Just have a quick question.  What does, 'f30t12' 'f24t12 
'f40t12' refer to in the listings of catalogs about electronic ballasts?  I
assume it referrs in some way to the # and type of bulb it can support.  I
apolgize if this is a juvenile question. 

gary plano jr.
jettat19 at mail_idt.net