Just made myself a simple LED light for the Prusa MINI.
Just ordered some of those cool USB keychain lights (www.amazon.de/gp/product/B071FJP3QH/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1) and added a simple USB extension cable (www.amazon.de/gp/product/B00NH136GE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1).
That's all. Enjoy.
Turn 45° around z-axis to fit to Prusa MINI print bed
The author remixed this model.