Sledge described the operation generously: the rooms teeming to the scrolled plaster ceilings with bud-heavy green stalks, the floor cabled with sprinklers, the walls lined with foil reflectors to maximize the ripening effects of the solar-spectrum lamps, the stereo chattering NPR talk radio to cover the drone of the daytime light banks, and classical music to give the plants a cultural heritage through the cool damp night.

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With the right combination of daytime heat and a smattering of light rain at night to cool the soil, they stand a chance of creating a standout vintage.

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But recent studies have suggested that certain types of light can boost alertness during the daytime, when melatonin levels are low.

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That is because this type of light mimics daylight, convincing the brain that it is still daytime.

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This is clear most notably in the case of industrial melanism, a process that turned light-coloured moths sooty black so that they would match their daytime perches in the polluted cities of the industrial revolution.

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While lunar daytime lasts around two weeks, and it may be possible to funnel this light into greenhouses, the current limits of solar storage technology are incapable of sustaining artificial light for the equally long lunar night, even with one of these guys helping out.

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