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i've like to know as well!!! i feel it's only purpose is to keep the board and diodes clean. a grow room is a filthy place and you don't want the inside of your lights to look like that fans!!
i've replaced all my plastic covers, they get hazy after a while and i want all the photons i can get coming through!!!

![IMG_3460[1].jpeg IMG_3460[1].jpeg](https://budbuilders.org/data/attachments/79/79635-af4b4d981184883e81a7155202b150ed.jpg)