On Fri, 16 May 2003 06:13:04 -0400, "Ray @ First Rays Orchids"
wrote:

Thanks Ray, and the other posters, for the input on my roofing
decision.

Different manufacturers may very well have different transmission levels in
their polycarbonate (note the "a") sheets.

That turns out to be the case. One manufactures gray panels let in
20% sun, the other, 84%. Same with the white, one lets in 45%, the
other 78%. I decided on the 78% white panels based on my local orchid
supply houses recommendation, and the information on the orchid
society web site about how much sun to give different varieties. From
what I could tell, 80% sun was about the most recommended. If I found
some need 100% sun I can move those outside. Being on the west
central coast of Florida, 78% sun is still one heck of a lot of sun.

My main reason for going with roof panels rather than just shade cloth
over my trellis was to control how much water they are getting when
we're in our rain every day season. With a 78% sun panel I'm
expecting to have to build another zone or two with shade cloth
anyway.

Once again, thanks to all for the help. Any Ray, I enjoyed your web
site. One of these days I'm going to try the hydro thing so you'll be
hearing from me.

bb