Richard

Chris,

The lumens in the diagram are only for light at 555 nm, not the entire spectrum of output. Output wattage on the other hand, is calculated by integrating across the entire spectrum of useful output excluding raw heat, typically 400 nm to 1300 nm. The needs (and capacities) of plants are usually published in watts per meter or watts per surface area of leaf (small scale studies).

The lights I am currently working with are in 20,000 sq.ft. and 50,000 sq.ft. plant shelters, although I have worked with small systems of 150 sq.ft. enclosures. The present client has the benefit of geo-thermal and water on the property, so that water and electricity come at a very small annual maintenance cost.

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