As for what type of light, this all depends on what color algae, theoretically if you want red Coralline algae to grow then you would want to use a blue/green intensive light, because red will do nothing to them (as it just reflects that light away). Or for purple algae you would want a green color light... etc.
For instance I have 220watts PC
(2x 55w Anticics, sorry I cant spell that, and 2x 55w 10k) which gives off a mostly blue hue, which is the reason why I have more red algae. But all around NOs work great, I even have CA
growth in my sump!