I have several different currently unused metal halide ballasts
dual 400 Watt (runs two independent 400W MH bulbs) can be used over one enclosure or over two seperate enclosures-depending how I mount the sockets.
Each bulb I have is 5500K or 6500K color temp.
Is there a way to calculate how much growing space each bulb will give me and how high should the bulbs be hung above the plants? 3 - 6 feet? I know the intense heat will cause dryness of the air but a humidifyer and fan should take care of it.
Thanks for your thoughts!