Well there all mix is 6.5 ph out the bag idk bout there light mix and u dont need to ph it anyway bio bizz is easy to use and a lil less concentrated in strength vs other organic nutrient brands with similar products in regards to there veg and bloom bottled nutes imo it is good stuff but i prefered it when it was just 2 or 3 products recently they splitting it up more also some folks dont use there veg nutes and use there liquid fish stuff instead im not so into that myself tho and oldtimer1 told everyone using it dont ph theres no need