I did not found how to show directly the picture, the do not work :/

You should use your brain too, it could be usefull for better reading. And I googled this and I searched on the forum.

My friends don't have such a dark night, and we are on the same server :/

Hey, I'm having an issue at night : As you can see I can't see anything, I changed HDR, luminosity and gamma but it's not helpfull. Any idea ?