Interesting, the company who made my west facing external blind said there is very little difference between colours letting heat in but darker allows you to see out better & lighter lets in more light, maybe that is just their fabric as it is very highly rated.
I think I have chosen what I will be putting on the roller blinds for my large west windows, doesn't need to be full block-out having the external blind but not sure I want to use the same elsewhere because of the heat issue. I did see some nice blind material in Spotlight when I wasn't really looking for blinds so will look there again.
These are the honeycomb blinds that got my attention, I really like the photo they have used, that may be swaying me a lot
http://www.blindsonline.com.au/honey...l-light-filter I ordered some colour swatches today so I can see what the fabric is like, keeping out the cold for the east facing window is also quite important.