The HPS is 400w. The camera I have access to will not focus when I get close enough to the plant to display the brownish spot. I have researched the data available on the site and the pics that were similar to mine were described as being caused by heat/light stress. I'm new, so maybe there is no such thing as light stress. I was simply repeating what I read.

The bottom line is: I moved seedlings under the HPS before I should have (1 1/2 wks). My only real question is: what is the potential harm if I put the seedlings back under the fluoro's until they aren't seedlings anymore?

Rusty, I appreciate your response. I was not aware that 4' could be too far away. (especially in the case of seedlings)

Well, unless I'm cautioned against it, I'm going to put them back under the fluoro's for a week or so.