Interesting study about the best red to blue ratio for LED


A little bit technical here but still a good source of info about the effects of red to blue ratio on tomato yield (average numbers of fruit per plant and fruit size). For a quick answer, just have a look at the figures and  conclusion. Enjoy!


  • lefsrud_-_supplemental_lighting_orientation_and_red_to_blue_ratio_led.pdf
    389.8 KB · Views: 175
Interesting read, but that was published in 2014 and most of the info sited is 10 plus years old.  I mean the conversation of HPS hasn't been valid in some time in regards to indoor growing..  Would be nice if it was current and based on improved tech over the last 5 years.
Indeed but the basis of the study still seems kinda solid. Don't know how much HID's have improved ever since but I guess that the conclusion might be even more in favor of the latest LED available right now...