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Is there an idiots guide to this anywhere so I can pretend I understand a bit more?
Yes, it's called A level physics. You don't really need to understand LEDs (or any other mechanism for turning electricity into light) if you're just a user, you just need to be able to read and understand the rating labels on black boxes.
gbj_tester
CYOA
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.