In shrimp tanks I've seen people use moss balls and rip them up and use them as carpets
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NOT normally a good idea. If you know how a Marimo moss ball creates more new moss balls (BTW Marimo moss balls are actually not a true moss but they are an Algae form) they eventually split and divide. The issue with doing this with a moss ball is that it will eventually create an algae issue. Most the shrimpers ive known actually prefer substances like Java moss (or flam moss, Peacock moss, Christmas moss, etc all true mosses) to do this with. They use a grid/moss growing mat to do this.
For the OP if your looking to keep the light not as high. Then look at doing a few moss mats and get them to grow out.