That's fantastic, Namunyu. And for the record, the string lights I mentioned have great longevity, and are able to store energy even on cloudy days. However, they are better used for exterior lighting. I am wondering, are you looking for ideas in respect to financing the purchases?
Solar powered string lights are also an excellent way to light up a space. GE makes a line with a battery that lasts years, a cell that withstands rain very well, and which turns off at dawn and on at dusk automatically. I would recommend connecting with GE and / or other manufacturers of mobile solar devices to negotiate pricing and delivery at a price that is affordable within the credit model you propose.