That graph that was linked is from plantedtank and it assumes that you are using good quality fixtures/bulbs with good reflectors, just something to keep in mind. For the most part, the big box store type fixtures are not emphasizing performance at all.
We have the HD T5NO lights mounted in our racks. They are great for lower light plants (mossses, ferns, anubias, some crypts and swords, etc), but won't grow much more.