Sibi: yes. That was a part of my original post on this and why I thought it more worthy of discussion. There were cases of eye problems with some long tubes though not at all as common but now there are even stronger high output long tubes plus metal halide. That's why I think it's good to keep this discussion going and exploring all possible contributions to the problem
Interesting! I have read all your posts, and you really have a way of explaining the various factors with the use of different bulbs. I enjoy your posts. Can you send me the list of various questions you posted by email? I'd like to answer those questions for future reference. My email is [email protected]