It seems to be an article-length piece, leading up to a downloadable spreadsheet. That's ... not so accessible. I quickly found [1] at Digi-Key which is a simpl

It seems to be an article-length piece, leading up to a downloadable spreadsheet. That's ... not so accessible. I quickly found [1] at Digi-Key which is a simple online calculator. It also features a handy table of reference voltages for various colors of LED, which I appreciated. Ideally I guess the color should be choosable and used to populate the voltage, but that seems to be Super-Advanced Thinking in this area. The full set of calculators [2] seems quite impressive and useful, too. [1]: https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-led-series-resistor https://www.digikey.com/en/resources/conversion-calculators/... [2]: https://www.digikey.com/en/resources/online-conversion-calculators https://www.digikey.com/en/resources/online-conversion-calcu...