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When in 36 hours of darkness how often should my fan be on?
How much hotter is the HPS from the MH (400 watt)?
What will the effect on my humidity be due to the HPS?
What humidity levels do I want for the first few weeks of flowering?
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1. I'd keep the fan running 24/7. We want strong healthy stems!
2. The bulbs should put out the same amount of heat.
3. I've noticed that higher temps bring higher humidity levels. As long as you have a fan blowing and keep temps relatively normal, this shouldn't be an issue.
4. Keeping a lower RH during flower is wise because at this point, the plant is more susceptible to mold and fungus. If your humidity levels stay at the high 40's just keep a fan running in there and you will be fine. I shoot for 35-45 percent, but usually stays around 45-59 percent. But sometimes as high as 53.
I see that you are trying to ease your plants into 12/12. I also wondered about this as well. Should we ease the plant into 12/12 so that it is less stressful on the plant? I mean, in nature it would gradually be exposed like this correct?
Some say the plant gets stressed when putting it into 12/12. I'm not sure what exactly it goes through, but I found that mine were drooping really bad as if they had not been watered in days. This occurred the following day after being exposed to 12 hours of darkness. Maybe that's what they are talking about? If so, I wouldn't get to caught up in gradually putting it in 12/12.