Hey Patrick, I love the input man thank you for responding. I especially appreciate that you backed up your post with numbers, as I do not own or know anyone who has a PAR meter. Furthermore, I never even knew that the optics would increase the concentration and PAR that much. I have the 90 optics as well, and I only have a 28g nano which I don't even believe to be as deep as what you say. Was taking the optics off very difficult? I have somewhat of a mechanical interest but really I love physics, bio, and chemistry, so if its really a pain don't even bother explaining lol. Seriously though man I appreciate the response though and if your numbers are anywhere near mine, which I suspect they are , I'm going to back off on power. Thanks very much boss.