The 5 is just more powerful and can run up to 4 bulbs... for me I'm always building light fixtures so seeing they cost nearly the same I choose a more flexible ballast thinking one day I will likely use it for another project... the 3 or 33 are perfect replacements for your fixture. If you are concerned about the size, they also make an "L" model which stands for Long:
http://www.naturallighting.com/web/shop.php?crn=628&rn=2936&action=show_detail
Giancarlo
--- In tropicalfishclub@yahoogroups.com, Larry Blanchard <labl@...> wrote:
>
> tuvix72 wrote:
> > These are electronic 55/65W ballasts. You will likely only find direct replacements for this online, the Fulham Workhorse 5 ballast is the most popular ballast used for 1~4 lamps as you have. They are very flexible and detect lamp length to determine the proper operating wattage. They usually run about $20-25.
> >
>
> Thanks for the info. I looked at the Fulham ballasts and this one looks
> like a pretty good match to the old one:
>
> http://www.prolighting.com/wo33elba12cu.html
>
> Up to 64 watts = old ballast spec. The size looks close. Length and
> height are the same. The old one is 2.5W and the 33 is 3.1W, but the
> enclosure is wide enough for the wider one.
>
> Any reason you would prefer the 5 to the 33?
>
> Larry B
>
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