400 watt hps & 50 watt reptile bulb. Bruce Banner #3 strain, awesome air circulation from ceiling fan and also have air purifier with UV part time. Pic is top & bottom of same leaf. Using Fox farm. Could it be a bad bulb? 55% humidity, temps in 70's day & upper 60's at night. My elevation is about 7000 above sea level in Colorado. Fresh air is abundant. All plants get spots under light about 18 inches from tops. Stumped...