i first added 2 of the LED bars to the outer edges of my plants and my yield increased from around 350gr per tray to 400gr per tray....i removed 1 of the 1000w HPS and placed 3 150w LED bars over one of my trays to see how they would do alone and the plants under the other 1000w in the next tray all started leaning to the LED's so i removed it and have been growing with nothing but LED's for about 4 months now! i have had 2 complete harvests with the LED's and the first one was 463gr and the ones i just took down this week shuold yield about the same...so i am producing around 1 gram/watt with my setup! :thumbsup:

after doing more research on the LED's and noticing more plant mass and healthier root zones it only makes sense that yields will increase with using the proper wavelengths corresponding with photosynthesis!:jointsmile:

the LED's i use have 52 3w LED's per 40" bar