I have two super silver haze autoflower plants in a small indoor grow. One is about 18 inches tall and looks very healthy. However it is now 90 days after germination and it does not have any flowers yet. At least none that I can identify. The light is 400 watt HPS and the humidity level is quite low, about 15% during the light times and a little higher in the dark about 25%. Right now the light is manually switched so not always dead accurate but mostly it is on for 18 and off for 6. Should I change this to a 12/12 regime even though these are autoflowers?