i am building my own greenhouse

i dont no much bot greenhouses, but i do no plants need light to grow, not direct sunlight, so id say it should be ok.

Glass doesn't let UV rays through either, that's why you don't tan indoors next to a window. So It should be fine. I assume you are going to use the stuff that conservatories often use for their roofs, so, again, that will be fine. Make sure it's properly fixed and can't blow off.