What about the ceiling bricks?
Your build actually looks pretty cool even with the limit on. Why are the rails brown though?
You put the light way too close to the ground. I usually use a 3x or 5x invisible-painted brick for ambient lights like that.I would put the light source slightly higher than halfway up the height of the ceiling for these. Since there's three lights in a fairly small area, you may want to consider only two or one actual sources between them if there's going to be any others nearby.