If I buy the Galaxy 12 Volt light, will I require the 100 watt or 300 watt transformer?
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You would require the PX100 100 watt transformer for either the pool or spa Galaxy light. Here is a link to the transformer: Intermatic 100 Watt Transformer
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For a color-changing LED light, how do I switch between the different settings with just a standard light switch?
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The LED lights are designed to move to the next programmed setting each time you turn the switch on and off. This will toggle through the different color settings and shows.
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