here is my take~LED's are the most efficient lighting as long as you have quality diodes and a properly designed unit:thumbsup:

cramming all of the LED's into a small frame is very inefficient...as most are 1w diodes with very high angle(120 or better)light spread...which means you have to get them closer to the plants to get good light penetration...then you lose coverage as the light footprint gets smaller...so with LED's you want to spread the lights sources as in the LED lights i use for max coverage and penetration of light....so it is better in the LED's to get 120-150w units and spread them.

and adding the HPS helps drive them in flower to transpire more increasing the yields while the LED's are the most efficient in providing the right wavelengths of light maximizing photosynthesis:smokin: