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whats a lowbay? and yes I own a house

everyone is always talking about using 400 watt bulbs, I am an avid saltwater coral reefer, and I have a 150w HQI fixture that I would like to use, its color temparature is 20K and should grow plants very well. so that using a 150 will make that distance less?? ie between the plant and light...

Whats the minimum height needed for growing white widow? I have what i think is a perfect place to put grow box, but not sure if its tall enough. It would be 43" from the floor to the bottom of the Metal Halide light I am going to use.