The RapidTables website has a number of useful calculators under the Lighting calculators tab.
These tend to be simple but can be chained to solve some interesting problems. For instance, to calculate the lux level from a typical 500 lumen LED (120-degree beam angle) at a 2-meter distance, we can use the lumens to candela calculator then use the Candela to lux calculator to find that a 500 lumen LED projects ~40 lux at 2-meters.
The calculation steps are explained on the website which allows one to construct Excel calculators.
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