Re: T-8 fluorescents

>From: Veselis_Robert_A/mskcc_SCU at mskmail_mskcc.org
>Date: Fri, 10 Nov 95 11:39:08 -0500
>Subject: T8 vs. T-12
>Item Subject: Text_1
>     >Hooray!!! Someone else who's dicovered T-8's.  Remember that the
>     watts-per-gallon rules are _very_ rough.  T-12's vary considerably
>     from one bulb to another.  When I do estimates on what I'll need using
>     T-8's, I figure as if they were 40W bulbs. (I know they're brighter)
>     It's amazing to me how many people are still paying the costs (up
>     front, replacement and electrical) for T-12's!<
>     Excuse my naivete, but what is a T-8 and what is a T-12? Do you need
>     special fixtures for T-8? Sounds like I should only get T-8 bulbs. How
>     do I know this when I'm buying them in the store?
>     Bob.

T-12's are the common, 1.5 inch diameter fluorescent lights.  T-8's are
only 1 inch diameter.  They are brighter, and you can pack them closer
together.  I made a light fixture for a fifteen gallon plant tank that has
four two foot T-8's, run by an Advance electronic ballast (REL-43P2-RH-TP).
This ballast can run 3 or 4 T-8's, which can be 48 inch, 36 inch, or 24
inch bulbs.  It cost me around $26.00.  Using a light meter, I found that
the four T-8 bulbs put out about twice as much light as three T-12 bulbs. I
agree with Karen.  T-8's are definitely better than T-12's.   I have plans
to replace the two T-12's on my 55 gal with four T-8's and the four T-12's
on my 75 gal with eight T-8's.

Paul Krombholz                  Tougaloo College, Tougaloo, MS  39174