420Coderanswered grow question 4 years ago Get a light meter. How much lux or par is hitting the plant?
The android light meter app I installed wasn't a perfect match to my meter, but close enough. If you don't want to buy a meter install the app.
If you can get 60,000 lux hitting the tallest cola, that is optimal - big buds. 30,000 will do the job. Assuming this is a full spectrum light.