Green Crack GDP 250w HPS flowering

So here is the update to my previous green crack thread. Very modest set up in my closet. The plants are about three feet tall now and still stretching. Only have two plants under the 250w hps because there isn't much space, but they are doing quite wonderful. I do have a small problem with white spores on the bottom leaves, I believe this is a humidity problem?

hey bro looking good. if you got a humidity problem u better take care of that soon now that there budding... can easily lead to SERIOUS mold problems later in flowering