400 watt lamp

I don’t know the height at which I should set my 400 watt HPS light and in how big of an area should I enclose it.
Ani,
Internet

Set the light about 12 inches from the top of the plant canopy. For the vegetative stage the light can be used to cover about 16 square feet, a 4 foot x 4 foot area. For flowering, the plants should have light in the range of 40-80 watts per square foot. A 400 watt lamp covers 5-10 square feet.

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