Excel kills algae. They won't advertise it but it does and does it very well.
The lighting comparison is from T12 lighting. http://woo.gotdns.com/Aquarium/Lighting.htm
Read that article, it explains it better than I ever could. Also input your tank dimensions and see where you stand for your lighting level. It is much more accurate than W/G.
As for nutrients, when I dosed my tanks using the Estimative Index I had little or no algae. EI is based on dosing excess of everything that the plants needs so there is never a shortage. When I would miss a couple days dosing of anything, I saw algae start to get a foot hold. I don't know how it works but as long as I dosed all my nutrients in excess I never had an algae problem. Yah I had algae but never more than a few spots here and there and never a problem to keep up with it.
FYI, the worst thing you can do is change the way you do things in the middle unless you need to. If it aint broke don't fix it. Big changes in anything including ferts and CO2 can cause worse problems than anything.
Oh and don't worry about questioning me. If you don't understand you have to question things, it is the only way you will ever understand the way things work and why. Remember also that just because I can do it and I give you the exact way I did things doesn't mean it will work for you. Tap water, regionh, plant types, substrate, feeding schedule, gravel vaccing, food types, and basically anything else can throw a curve in the equation. The best way to make it work for you is to get as much information as you can and make the parts come together the way you can make them work. Is how I had to do it.