This is a great little light - it definitely brings some light into the container. I'll be honest: the light it reflects in is no wonder, a small window would give more light. I suspect the idea is that window cutting is generally less safe, or maybe if you have containers lined up next to each other it's ideal. Also, it wasn't compatible with the roof pattern of my 40ft container, so I added it to my 20ft container. Container. I would give it 5 stars other than judging the light it emits andβ¦