[hornychz]

Thanks for your help peps!! This forum made it possible for me to build my pv-cell pyranometer based on an ALDI garden light (attached) with a friend of mine! It will be used to validate machine learning GHI predictions of my master thesis in rural Kenya to improve the efficiency of rural electrification.
It logs the data on a micro SD card to be independent of potentially lacking IT infrastructure and is powered by a battery to be independent of missing power supply. The best feature is probably the fancy cord handle, hence its potentially the most haute couture pyranometer ever build.

Congratulations! Good job. 

(Just remember that a solar cell is likely to last for one, at most, two seasons. Then it needs to be replaced - it will be completely gray ...)

I keep my fingers crossed while you working on the PhD!