I seen something today that was written by the jungle boys, this is just the jif of what they were saying so not my opinion, they said in smaller rooms, or lower ceiling, shorter more compacted plants , that kinds thing, LED's were great and the way to go , but for bigger more open rooms . higher ceiling and taller plants he said DE HPS hands down, He said they tried LEDs multiple brands including Gavitas He said they had to used more fixtures and in the end was using the same amount of watts or more, and in his opinion, the final product was as nice. but he seem clear smaller rooms plants etc LEDs were the way to go .