Sending the bulbs back for a swap with bulbs with no plastic lenses in. It's kind of obvious what's happened now, thanks all, just hope I can recover them.
These were the same plants thursday night, so much devastation in such a short period. Definitely had a shock to their system and like you say they could have tried to draw a lot of calcium to combat the extra light and burned them. I've removed the light and flushed then done a foliage misting...
Yes temps are spot on, gauged digitally with sensor inside grow room, done successful grows before in same environment. We're experiencing humidity fluctuations recently due to heavy rain then dry spells and has been fluctuating between 50 and 65% but friday and sat were a little lower at 45%...
Plant: Green Gelato
Soil: canna 70/30
lights Viperspectre 350w LED at 16 inch during flowering.
Feed Biobizz bloom once a week, followed biobizz feeding plan. cal mag once a week.
lights 12/12
Humidity is been fluctuating between 50 and 65%
I'm 5 weeks into flowering and everything was going...