This looks like the API I was looking for to compute the best screen brightness in the absence of a light sensor in Lunar [0]
I would probably do a request per day for each user of this feature, which would amount to about 300-400 requests/day. Would that fit in the non-commercial use tier?
I would be happy to start paying like $5/month if I'll find a way to improve the brightness calculation logic with your API. If you don't yet have a payment processor integrated, maybe we can work it out through something simpler like Patreon or Buy me a coffee recurring payments.
What I'm not sure about is what data would best fit my needs. I was thinking of using Cloud Cover first but I don't know which one would affect the daylight perceived brightness:
cloudcover
cloudcover_low
cloudcover_mid
cloudcover_high
There's also the (new to me) sun radiation data which seems even more fitting to what I need, but again, not sure which one to use:
shortwave_radiation
direct_radiation
diffuse_radiation
I would guess that direct_radiation is what I need but I thought I should ask first in case you have more insight into what data would most fit my use case.
[0] https://lunar.fyi/#location