Often finding precise information for light values is quite hard, so I use those 3 websites: https://growlightmeter.com/light-requirements-for-plants/ https://plantlightdb.com/?q= https://www.houseplantjournal.com/bright-indirect-light-requirements-by-plant/ (Scroll down)

They don’t always agree but they are a good starting point.

My husband and I use a spreadsheet. It has a picture of the plant, information on care I pull from the web (so many great plant care sites around!) and a bit of info on when it was watered last and when last fertilised etc.

We have a large collection but the spreadsheet is still easily manageable.

I’m interested to see if there are any good FOSS options! I’ve used planta a bit but it has limited features on the free version and I do not need yet another paid subscription.