I bought 5 of these industrial lights for $69 each with free shipping. I read online these lights are used in commercial green houses. 1 light will probably be great for home use in your grow room or green house. According to my electric bill it costs me 11 cents per hour to run 1 light. If any one is interested here is Amazon link to order lights. Orders over $99 free shipping.
https://greenlightdepot.com/collections ... 1428591659
Here are photos of the box. Lights are about 15" diameter, weight about 8 lbs, hang by hook from ceiling, run on 120 volts AC, very easy to install about 5 minutes work.
These lights are very low cost compared 21750 Lumins they produce at low cost of electricity.