Motion sensor sectorizer

This small thing is to block my small under desk storage light to come on while walking by in the general area. It should only come on while searching for stuff in my "storage system". 

I attached it with a small amount of blu-tack for testing.

The light is:
https://www.clasohlson.com/se/Lampa-garderob-batteri-med-sensor,-rund,-laddbar/p/Pr369969000

Source file included if you need to adjust angle or height or anything really.