Readership,
What harm occurs to either of a ballast/bulb
if one of the bulbs, in a 2_bulb, T12 fixture, is 'absent' ...
or
switched out of the circuit.
Have googled, but not hit upon the proper query argument
to locate a comment.
Ed.
It depends upon the ballast design, and the type of T12 lamp
and even the country where this fixture is located.
I will assume the fixture is located in the US and uses
4-foot 40-watt or 34-watt lamps - only because these are the
most common type of T12 lamps used in the US. Since the
lamps are T12 I will also assume that they are being
operated on a electromagnetic rapid start ballast with
series sequence starting - again, only because most T12
lamps operating in the US use EM ballasts and most T12 EM
ballasts used in the US are rapid start and use series
sequence starting.
If all my assumptions are correct, and you remove one lamp
the remaining lamp will operate a very low power or not at
all. The ballast will not be damaged, but the remaining lamp
may be if left in this low power condition for many hours.
If the one remaining lamp does not light, it will not be
damaged - but also doesn't produce any light so it is
useless.
If my assumptions are wrong then anything is possible.
--
Vic Roberts
http://www.RobertsResearchInc.com
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