Black Dog PhytoMAX-4 24SP 1500 Watt LED Grow LightPhytoMAX 4 LED Lights Will Give You Superior Yields At 3188 mol s photobiological photon flux (PBF) and 1500 watts, the 24S light is the powerhouse of the PhytoMAX 4 line. PhytoMAX 4 lights are designed to grow the highest quality and highest quantity harvests. Rather than striving for the highest possible photons per watt, PhytoMAX 4 is designed to give the highest yield per watt while maximizing terpenes, pigments and cannibinoid production.