Growing orchids outside

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Hello

Last year I grew my orchids outside behind my shed, however. they did not recieve enought light. This year, I am planning on placing them on the right side of the shed, inbetween the shed wall and a fence. The only problem is that the plants would recieve too much bright afternoon sun. I plan on purchasing a 5- tier "heavy-duty" shelving unit

similar to this, but black

Sterilite 5-Shelf Shelving Unit, Light Platinum - Wal-Mart

I was planing on placing shade cloth on the side of the shelf, as well as on the top, in order to keep the direct sun away from the leaves.

Is this enough shade? Should I use black cloth? Also, Might the black frame cause it to get too hot?