I think it's always good to get other's perspective. But I find it really depends on your situation in terms of how much natural light one has, the size of you tank, the current wattage/gallon and how much light is penetrating, plant needs, etc. I think a lot of it is also trial and see what works best for your situation. As for me, after 1.5 years with my tank...I'm still trying to figure it out...LOL.