just changed my light from florescent to High Pressure Sodium light my plants are 6 weeks old now and i switched them to 6 hours off and 18 on now and the one plant went from 8 1/2 inches to 10 inches now in 2 days of light change is 10 inches and 7 inch fine in height i'm worried i'm doing it wrong how would i know they look good but other say stater over friends that is no one on here everyone on her say they look got please help me out look at the pics of my plants and let me know thank you