I've noticed some issues in pak128 with stray glowing pixels, and today it bothered me enough to fix these errors. ;)
The updated files are here:
https://dl.dropboxusercontent.com/u/53679800/Simutrans/lighting_fixes.zip (https://dl.dropboxusercontent.com/u/53679800/Simutrans/lighting_fixes.zip)
commited r1539, thank you very much for your help !
There are probably still tons of night color bugs. I lack time to take care of them seriously so if you find other glitches like that, feel free to tell me where and I would fix it.