KingJohnC;1881959 said:
How To Use Progressive Web App aka PWA On 420 Magazine Forum
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KingJohnC;1881959 said:a 400 watt light will cover a 4'x4' grow area. add as much light as you can reasonably cool, a 600 watt digital dimable ballast can also be dimmed to 400 watts.
here are some charts that show Lumens versus distance, they do not account for heat.