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>So the sunlight->panel->led->light conversion does waste ~90% of the sunlight. >This is made less bad by not lighting plants with white light but purple light, but clearly solar panel on the roof, plants indoor don't make much sense.

Why not? Wasting 90% of the sunlight is still better than using sunlight directly, where the plants themselves only use 4-7% of the sunlight. The plants are wasting all the green-spectrum light, which is where most of the sun's energy is.

Besides, you wouldn't use white LEDs, there's no sense in that. You'd use LEDs tuned for the wavelengths that plants actually use.

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