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Just looked those up, and they look really nice. At $49 each, hope he doesn't need too many! I'm using daylight extension with clamp-on work lights and CFLs, but your post got me wondering about night-interruption instead. The article claimed that 4 hours of light was required in the middle...

I'm doing the same thing with my balcony grow, and no, you will need powered lights of some sort. Here is a great article that discusses both daylight-extension and night-interruption lighting in commercial greenhouses. Can you get an exterior-type extension cord to your plants? You will need...

Or, a heater! Relative humidity is dependent on air temperature, too. If the water vapor content stays the same and the temperature drops, the relative humidity increases. If the water vapor content stays the same and the temperature rises, the relative humidity decreases. This is because...