Response to Hi Yvonne, The easiest way to tell which which voltage you have is to remove the bulb from your fixture and the voltage should be noted on the light bulb itself. We have a Guide on How to Replace a Pool Light Bulb that will show you how to do this. Also if you have a 12V light you should see a transformer which looks like the PX300 Transformer. If you have 120V lighting then you will not have a transformer and would require the 120V Pure Colors LED Bulb.

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