Precomputed Global Illumination

Ok, So how can i load precomputed GI from certain position of sun???

Im precomputing successfully GI in Lighting > Generate Lighting. I have in scene directional light (sun) and each position of sun is creating nice realistic illumination. Im generated some positions of sun (daylight system). But if i precompute at last lighting at DAY and launch game and time go into night, i have still everything too much light. And conversely. How it does work?

Thx for help.