im bloody hoping!!! to be honest, the 150W just did not cut it, to many shaded areas and it was quite obvious wen i saw one half of the same acro showing signs of colour and the other side was brown! however it was when the 150W'ers were supplemented with T5's did improvements start to be noticeable, however there were still shaded areas. because of the aquascaping in my tank (the "rock wall" look, which i incidentally hate but arent going to change it til i upgrade) its hard to position corals in any place because of the shaded areas. since the move to 400W over 2/3's of the tank, the intensity is insane. i've taken 'before' pic's now plus am making note of what else is changed so I can see any changes with 400W lighting. watch this space