Very neat project.
Thanks for sharing. I began reading this thread a little over a year ago when you first started this project and promptly lost track. After catching up, things have really progressed nicely! I may have to run down to the local RShack to see if I can pick up one of these Arduino things, an LCD display, etc., and build one of your PAR meters myself now! It doesn't seem terribly difficult, but at least I can always come here if I have any questions, I hope. Thanks again for all your hard work, both of you, and for sharing.