In article ,
Marco Schwarz wrote:
Hi..

Hmm.., as far as I remember we continental Europeans used
those thicker tubes until the 70s (80s?) and that we were
later able to use newer (and thinner) T8 tubes in our old
lamps..

http://fm.atalink.co.uk/articles/article-161.phtml

You can drive T12 tubes with a T8 ballast but not vice versa
if I read this correctly.

http://fins.actwin.com/aquatic-plant.../msg00240.html

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