Last year I tried to grow some veggies indoor under lights. I tried a few leafy greens and raddishes. One of the greens was arugula. I found that it did not grow nearly as many leaves as expected before it started to flower. It was a very poor result. I am using two 6500k tubes. I'm not sure how many hours I had them on but it was likely 10-12. Could my poor results have been from have too much light?