Originally Posted by BlueRam
Lighting in aquariums is by far less than the tropical sun at noon.
Yep. That is true. Good point. Different species have different needs though.
And my aquarium doesn't have a heavily shaded mangrove inlet...a 3 foot drop-off...the ability to go upstream 100 yards...or any of the other true refuges found in the biotope.
The main reason for lighting (and thus control of the lighting) is to grow the plants and see the fish, but let's not forget the preferences of the species. Too much can be too much for the little fishies too.