We designed 200W solar street light solution for this mini football court, below is 3D simulation for this mini football court:

From the Dialux, we can see U0 reach up to 0.63, very high for light average illumination. 4 lights in 4 corner can cover all the mini football court.

Also, height of pole is very important for illumination, if pole height less than 10m, then U0 must be less than 0.5, then some area too bright, but some area is a little dark.