A quick video on how to yield once a month MARS HYDRO 300 WATT LED LINK!!!! https://www.amazon.com/gp/product/B00XC3LBI2/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00XC3LBI2&linkCode=as2&tag=mackerel619-20&linkId=4f4128d9e04ecc753c62f3bbccbbc8cf all videos are for educational purposes and meant for adults 18 and above.