More or less my understanding too.
BUT what I'm trying to say (about LED tubes) is not about ballasts not needed, etc, BUT that according to the retailers here, no one makes a 90 cm long LED tube, and for the older fluro fittings, 90 cm used to be a standard length, now apparently discontinued - here anyway.
So that means me either fitting an old type 90 cm fluro tube (IF I can get one, I can here); OR chucking the whole light fitting away because none of the "standard lengths" of LED tubes available here will physically fit my old 90 cm fluoro fittings (they're either a bit too short, 85 cm; or much too long, 115 cm).
OR, have I been mis-informed??
(Sorry I wasn't too clear previously).