Noob: Am i over feeding ppms

hello, my father died and before he died when explaining feeding he gave me a wand or long stick with lots of lights on it and said keep the lights around here... it was 3/4 of the way up the stick.. no idea what that even meant.. but after watching mr grow it videos, i now have a question.. i am using rockwool with clay balls in a basket with a dripper watering system on a timer 15mins a day 6 times a day... now i got a digital ppm meter and i put it in and my bucket says 1680ppm .. i have been using this in veg state and flower state.. should i reduce my bucket too 700ppm? or do i need higher ppm for my watering method? i am using Cygo Grow A and B neutrients and i have Bloom A and B also.. but this bucket is Grow

Thanks

Chris