I don't have any testers. I had the lights up 12 or so inches from the plant, and I used full strength nutes which she never liked even in veg. I swtiched to half strength way too late and it looked like that was a good move but I also added in the LEDs that same week so i'll never know what really caused it.
I still have more seeds from this strain but I won't be growing them anytime soon. When I do though i'll be sure to go easy on her and see the difference.