Well here is my situation and my question. Sorry but this is a bit of a newbie question:

I have a hydrosystem setup on my screened in porch.

1. I would like to know if there is a way to get more sunshine on my porch without altering the structure (no roof holes, etc.) I would like to avoid using a growlight.

2. How do I measure the amount of sunlight, how do I know if it is enough? I know that the second part of this question depends on the plant.

Thanks for any help/