I think you're almost there Ola. As ever, Tom is always right :-) The first 3 numbers shouldn't need entry if generated by blender or your 3d software- they're just the coordinates of where the light is situated. The next 3 are the direction vectors. At first I found it confusing, but after awhile it's alllllmmmoooosst second nature! Middle no. Was my problem- its the angle of the light up or down-eg 0 is no angle upwards or downwards, best for wall illumination say. But then not, as it doesnt spread as nice. Just a lot of experimenting with the different light types and positioning is required. Eg for the building lights, putting the light too close to the wall causes the spill to be too small. It's only early days, I'm just gonna try a few named lights to see their effects, good fun but time consuming. Hmm, It might be quicker to copy an object and light 50 times and just copy as many light types from the lights.txt file as possible to the generated obj file for a quick comparison! I might try that tomorrow and post a screenie. But so far, I'm thinking that for general subtle building exterior illumination, good use of photoshop is 90% as good as the global lighting. I think mixing a few hdrs in will give a great mixed effect. Street lights, for ground illumination, well u can't beat the hdr look! So we should both keep experimenting and show everyone the results, be the innovators. What I'd really love to do is hang a big spill light on top of some of my sky scrapers, and modify the rgb colours so I can get a nice natural roof lighting feel. Those who've seen Sydney's skyline will know what I mean. So if u work that one out, let me know! Like a powerful obs_red_night but with colours and throw variable. Grrr, I can already guess it'll have to be a 'custom' light. This is amazing stuff though. Seeing a building lit naturally, knowing I got the coding and position right- wow! U don't see these effects in fsx - hell, in very few games! I went through the city at ground level, with the buildings in good position, you get a real feel of GTA or need for speed!