Sativa Strong Strains

I think the flush helped, It had the run off after this feeding at 300 ppm so the back to back heavy feedings not a good idea, have some burned leaves and lost some time lapse days but they seem to be doing ok. got 4-5 more weeks till finish I think I will let them go as long as i can to get all the buds to develop. of the 4-5 weeks left I will feed lightly 2 more times and water in-between until the 2 weeks of flush. I really need a new light with white LEDs the color correction is all over the board. any recommendations for lights let me know. be safe.