Important Notations about PL-S Light Bulbs:  If you are using a 13 watt PL-S Light Bulb, you may not use any other wattage as the bases are different and they will not plug in properly to your fixture/ballast.  Conversely, if you are using any other wattage of a PL-S, you may not use a 13 watt bulb in your fixture.  You can however swap out any of the other wattages:  5, 7 or 9.  The other important thing to note is that those 3 wattages of bulbs are different lengths.  The higher the wattage the longer the bulb.  So, if you don't have much room in your fixture, you may not be able to exchange wattages.  See the length of each bulb in it's item description below.

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If you need a different type of compact fluorescent, take another look at the major catagories of compact fluorescent light bulbs.