just wondering


Old 01-02-07, 06:55 AM
Thread Starter
Join Date: Jan 2007
Posts: 3
Question just wondering

Do florestent light ballast use watts if the bulbs are burned out ? or is it just like an incondecent bulb, cir. it broken so zero watts used.
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Old 01-02-07, 07:45 AM
Join Date: Nov 2004
Location: CA
Posts: 2,041
No sure answer....depends. Some fixtures have the bulb in series with the ballast, some use other designs. You would have to have a wiring diagram of the ballast iteslf to know for sure. One way to tell is if the ballast feels warm with bulb bad. Some lamps have a preheat filament, so in most cases, at least that much current would continue to flow even if the arc did not strike. Again, you need a schematic for that balllast. Manufacturers like Advance Transformer and Magnetek have wiring diagrams available on their websites.

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