solar greenhouse

Does anyone know if you can use Lexan in a solar greenhouse? I can't find definitive information on whether the uv spectrum the Lexan blocks is necessary for heating. It appears to be fine for plants, but I want the uv rays to passively warm a heat sink, like water or rock.

Yes. Expensive.

Is there a cheaper alternative that is similar to lexan?

Firecraft wrote:
Is there a cheaper alternative that is similar to lexan?

Cheaper. Look at fiberglass like Kalwall. The lexan is great stuff, just expensive. My father has it on his greenhouse and loves it. I would love to have it but it is outside my budget right now.