I've been searching for an answer about this for hours but I've found nothing on it. When I was exploring the decompiled Valve maps, I noticed that almost all of the indoor lighting is using a light_spot entity. I poked around in several maps to get an idea of how they used them and what settings were used and where. After some time I moved on and went back to my WIP and replaced some lights in a few rooms with light_spot. However, when I compiled the map and looked in the room I found that the ceiling was completely dark and was receiving no light at all. I've messed with the settings on the lights more than once. I've tried a final compile in hopes that the light would be bouncing more. Nothing. Any ideas as to what Valve did to light their ceilings? Here are some comparison shots.