Recently installed a 7 x 14 50% aluminet on a clear roof, and a 7 x 11 50% aluminet along the side of a custom greenhouse that is covered in clear vinyl. It is amazing. You need to consider many factors. Are there trees around you? if so, if they are not evergreens, they loose their leaves in fall, and you then have very bright light. If you get leaves in the summer, you may want more.
My friends situation has 2 100' trees just south of her greenhouse. I selected 50%. Still not sure how much sun will filter through the leaves.
If you need more, understand that combining a 10% shade cloth with a 50% one, does not block out 60%. Rather it blocks out more.
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