Before I changed my 175 10k hamiltons/ushio, I definately started to see effects of the spectrum shift. These bulbs were 12-14 months old. I had an acro that was growing very steadily for months that had started to lighten up on the upper branches, slowly bleaching. I had also noticed significant colour loss in some of my other sps.. Colours have regained now, but I almost didn't notice before since it was so gradual..
Here's the visual difference in spectrum shift.. Old on the left and new on the right.. I asked Allen at J&L and he said there was no change in the manufacturing of the bulb.. (though he could be wrong). Does seem quite significant to me..
The way it looks to me, is that spectrum shift will effect sps corals first. I saw no change in my LPS after the bulb change..
