Maybe the water will not get to a boiling point, but either way, even if it just evaporates much faster it'll be enough. Also, I plan to add a cheap steam turbine (maybe designed from common, easily found, parts) and a charging circuit such as to charge a battery sand thus be able to use the system as a basic power generator.

I also have an idea, I don't know if it will work or not, but maybe one can "focus" light using a CD by writing the CD with a specific pattern using a computer, basically creating somewhat of a CD lens. I need to try this out to see if it could work.