I'm planning on building a shade structure for my orchids to sit under, since there are very few oak trees surrounding the house to shelter my orchids under from the intense mid-day sun. I have a diverse collection of 'chids as you can see from my list. I've acquired a few more from ebay. What would be the appropriate % shade cloth to get for this project? Which material would be better the standard black shade cloth or new Aliumnet?