On Sat, 25 Jun 2005 01:32:56 GMT, "JohnR66" wrote:

"Blue" wrote in message ...
Why is it that when one flourescent tube goes bad they both go out? Does
that always happen or just for my tubes?
The tubes in most rapid start twin tube magnetic ballasted fluorescent
fixtures are connected in a series circuit so a falure in one tube will
cause the other to not light or light dimly.
John


Also, similar tubes expire at the end of their useful lives at about
the same time. In some cases, one tube might still light, but will
suffer diminished output due to staining at the electrode ends. This
is normal.

It is better and economical to replace both at the same time in either
case.. You're ballast will last longer too.

Beachcomber