Total lighting, but I prefer to have only 30% of the total lighting actinic--the brighter lights are more beneficial to photosynthetics, IMO. 4WPG is still a bare minimum--I had xenia that would live, but seldom pulsed and never spread under 5.5 WPG. Moved up to MH, anbout 8 WPG total, and now it pulses constantly and spreads all over. Corals that had limped along, now are huge and healthy--the importance of lighting can not be underestimated.