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grams in reply to @CYOA

LEDs have a fairly narrow voltage range below which they won’t light and above which they won’t light ever again, so the difference doesn’t matter.

For anything white 3V is a reasonable rule of thumb, but bright lights tend to put many diodes in series, which isn’t mentioned in the specs.

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CYOA in reply to @grams

I see the words but can't do anything meaningful with them.
I'm planning to order 1 of these: https://www.amazon.co.uk/gp/product/B08HZ7QYBK
Should I order 2?

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gbj_tester in reply to @CYOA

Should I order 2?

You only need one as long as the leads to the light controllers will reach from the extension to the light position, and you could run up to four of those lights from it as long as it's fully unwound from the reel.

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