Thanx Boney, thanx Hawkfyr! I will try your advice this evening when I go back home. The problem is that these lights are grouped circles, I had made a "light ball" following a tutorial and imported it. There are dozens of lights "trapped" by a wireframed sphere. I deleted this sphere and ungrouped the various circles of lights, which I put here and there. I don't ungroup them because they're too many. Antialiasing is on and it is a camera view. I don't understand what you mean for infinite skyplane. I put a preset which I changed, deleting clouds and changing colors. haze and fog are off. As lights are grouped I can't edit them. Shall I have to ungroup and edit one by one?....sigh......