On Thu, 19 Nov 2009 09:14:47 -0600, dpb wrote:

dgk wrote:
...
Ok, just hold on a minute here. The new tubes I bought for the new
fixture were much smaller (diameter) than the old tubes in the old
fixture. Do I need to check that they are either T8 or T12 and also
what the fixture is?

The smaller (1") diameter are T8; T12 are 1-1/2" D.

http://www.ehow.com/about_5426758_fluorescent-vs-bulbs.html


Ok, then I have T8 and the fixture is for T8.