Well, looking at the website didn't make me much wiser. It should at least state how many are in a package (if it's packaged) and how many m2 it covers. However, a rough estimate suggests that between 210 and 235 lm might be needed. (Entirely depending on how much they overlap.)
 
If you guess that 15 mm disappears in overlap, it becomes about 290 m?
 
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Vi vill skicka notiser för ämnen du bevakar och händelser som berör dig.