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How to Evaluate a Commercial El D Light?
The cost of the fixture, wadage, output, efficiency or efficacy of the fixture and then beam spread of the photons. It's possible to make elides very focused. But it's extremely difficult to get uniform light if your fixtures are so that or that focused. So often, high pressure sodium, we mount em up high. They spread the light out. The result is more uniform light for the or the plants.