Rosyboas spend most of their lives in burrows and in and among rock crevices. They do not need lots of light, but they should have access to even very filtered light for light cycle purposes. If you look at rosyboa eyes, you can tell they are well-suited to low-light conditions. In the wild, they are often out and about at dusk or evening. During midday they are usually hidden. So rosies are not needing lots of light.

Simply having some air holes in the lid and sides with a low-wattage fluorescent light nearby should do just fine. Enough light will likely get through to provide a light cycle. You do not want or need it inside the cage.

As suggested previously, a clear window is another option. IMO, with plastic storage boxes, it is easier to drill (stepped drill bits work the best) or poke (soldering iron) numerous holes to be your window of sorts than try to cut a large hole without damage for a window. With the numerous holes you do not need to cover it with clear plastic.
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Mark

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