I came across a really well written reddit post about LUX & Lighting I’ll link it.
It’s really inofrmative written by HandsOnComplexity
https://www.reddit.com/r/HandsOnComplexity/comments/17nxpy/using_a_lux_meter_as_a_plant_light_meter/
Here’s a whole bunch of his links on a range of topics I haven’t read them all but I’m sure they’re good
https://www.reddit.com/r/HandsOnComplexity/comments/s4wcmh/sags_open_access_cannabis_links/