The biggest problem would come from the cold roots.
Better to lose lighting, than to have them stay on all night...but they should be fine.
Is it raining in your growroom? 99% humidity seems a tad high. Humidity that's consistently that high is a BIG problem in itself. It can short-out the HID lights, (which if cheap, aren't rated for wet enviornments) and can create a condition where mold grabs-hold of your buds.
Rusty Trichome Reviewed by Rusty Trichome on . Light Failure 5 hours !!!!!!!!!!!! NOOOOOOOOOOOOOOO... What happends now..?????????? Hi Guys, i am into week 7 of flowering my G13 Haze, im taking them to aprox week 11.. This morning i checked the babies to find out the main circuit breaker had tripped in my grow room, the lights were due to come on at 6am... I checked them at 10am only to find the fans not running, the humidity at 99% and the temp down at 15dec>! It had been like this for 4 hours..!> Hope this hasnt turned them into male plants.!> First problem ive had, (first grow) my question is what affects this Rating: 5