You are in the Arduino forums but unfortunately no matter where you go you will meet a lot of people who forget what it's like the first start and think they're better then everyone else. No question is a stupid question unless of course you're asking it on their forum. Everyone forgets that if it wasn't for people like you asking these questions over and over and over there wouldn't be so many places to go to find the answer. Sometimes it just takes a different way of explaining it for somebody that understand it.
Unfortunately I have not done anything with a par sensor but will be building one here soon for my grow. It just really irritates me when someone asks a question and the first response is have you Googled it. That just tells me they don't know the answer. Yeah I Googled it and even if I hadn't that's what forums are for.