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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.
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? -
a fairly narrow voltage range below which they won’t light and above which they won’t light ever again
All diodes are light emitting given sufficient power input, although only very briefly😀
CYOA
gbj_tester
Is there an idiots guide to this anywhere so I can pretend I understand a bit more? A quick skim suggests forward voltage is what it takes to kick it into life vs what is actually being drawn and used but that's probably wrong.
Edit; found this saying that LEDs etc don't follow ohms law etc https://lednique.com/current-voltage-relationships/iv-curves/
But this seems less an idiots guide and more a fairly capable person's guide.