Thank you for your detailed answer.

The reason I was curious about the wattage calculation for switches is because I have seen others that appear to work this way - it can handle about twice the amps at half the volts: https://www.amazon.com/Solder-Wired-Rocker-Switch-Toggle/dp/B07B9RPLZD

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I like to ask because you never know if the amazon/ebay/other cheap outlet is labeling this stuff accurately. Thanks again.