They all claim they are full-spectrum, but Ott Lite says they are better than all the rest. Go by the index numbers on the specifications. The higher the number, the better the light. I personally have used Chromalux and Vita-Lite, and both seem to work quite well. Note that the incandescents give off a considerable amount of heat.
Light is light, it just needs to reach the bird.
With the fluorescents, I placed them anywhere from 1 - 4 feet from the cages. If you NEED the heat of the incandescent, like for a sick bird, it should be within 1 - 2 feet so the bird can feel the heat. If not, it should be further away so the birds don't get too hot. Note that the full spectrum of sunlight can not penetrate glass, and that even a few minutes outside in sunlight, or sunlight through a screen without glass, is more beneficial than hours of exposure to the lights. Only if you have the lights on them so much that it interferes with their sleep cycle, or so close to them that they overheat.