Maree !!!! As long as they don't start turning yellowish brown you should be fine. Consider the reddish tinge a sun tan for the orchids. If you are conserned move it into a shadier place but it should be fine.
Thank you Roly, As the sun gets higher and the leaves start to come out on my oak trees it will shade the baywindow and orchid and it should be more filtered. I will keep a close eye on it. A suntan is not bad, right?