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Re: [APD] Reactive Ballast
If the tube does not have a starter built in then it will have 4 pins.
With built in starter it will have only 2 connection pins. The 4 pin
version is suitable for electronic ballasts. A bit rare these days.
>Some of the small bulbs, like many 7, 9, 11, and 13-watt u-tubes, have the starter built into the base of the bulb. For these bulbs you would want to stick with a magnetic ballast. Some of the small u-tubes don't have the starter built in but those are kind of hard to find.
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