>Finally, ordinary glass absorbs a huge amount of uv up to 80%. That's why I don't use cover glass under my Hagen ReptiGlo 5.0. >but............I thought that plants absorbes red and blue light for >photosynthesis anyway........so what would be the point? No but some plants use anthocyanin (red pigment) as sunscreen against UV-B. UV-B = Redder plants. // Daniel.