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Originally Posted by nickb
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In addition, Lamps should NEVER be wired in series. Running the bulbs in series would reduce the total number of turn-on cycles. There is no correct estimate of how much reduction because it depends on the lamp types and its wattages. If the single lamp voltage requirement is close to the ballast starting voltage, the addition of the second lamp will cause problems. We do not recommend series wiring with instant start ballast, however, if you have a continuous burn application then series wiring of lamps is ok
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At least one manufacturer using Fulham ballast (CoolTouch lighting) has changed to use one ballast per bulb.
I'm still using the series connection but will be looking into switching over to one ballast per bulb.
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if you read that they admidt the only thing is going to be reduced turn on/off cycles sence the commen aplication for these ballast is lighting they are turned on and off several times a day, we only do it once. so even at a reduced on/off cycle it will suit us just fine. remember the big key is not to exceed the total lenght though, so you cannot do it with anything longer than 8 feet of tubes.
Steve
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