I use Aluminet Shade cloth on my Gh with great results. Black shade cloth doesn't make sense. Black absorbs heat which is what you are trying to avoid. The aluminet reflects it.

I just got www.charleysgreenhouse.com 'CHILL OUT' heat reflective shade cloth and think I will love it. Have you seen it, I haven't seen the 'ALUMINET',where did you find it?

You can find it on internet or at one of your local hydroponic supplies stores.

I bought from Charlies last year, enjoyed perfect results and look forward to rehanging again when the heat dictates. My Chillout looks just as it did, new, last year, and I am deffinately sold on this product, I found no negatives, and the snaps are so perfect! If you want shade and heat reduction, yet still light to grow, try this and share your experence! I'd love to hear what you think, and what other uses you have thought of for this perfect product!

Update, I have re-hung my Chillout reflective shade cloth and am impressed, it is as 'new' as last year, and an excellent product. I Highly Recomend this product!