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LED's do offer an advantage of light without much heat, which in large
applications would be a boon, as many plants can take higher light levels if
they are kept cooler. Additionally, as LEDs emit in specific wavelengths,
I suppose it is possible to provide an array that optimizes the overall
spectrum. The relative energy-efficiency of LEDs is also well
established.
As the relative value of those first two advantages is in the
"marginal-to-OK" range compared to other lighting sources, in my opinion, the
cost is going to have to come WAAAY down before any of the benefits become
worthwhile for the typical grower.
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