Window shade for orchids

[RosieC]

I agree that a red tint is not a problem, but a sign it's about at the upper limit.

I use a spare sheer/lace curtain in my greenhouse as a shade cloth. Seems to do the job and I just take it down and wash it over the winter, then back up in the spring.

My catt on the other hand is not in the greenhouse, but outside in full sun. Now I probably get less sun here in the UK than you do as mine's not even got a slight red tint. My dens that are next to it have a red tint though and I'n not concerned yet as I've seen them redder with no problem.