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Answered 2009-11-30 20:35:43

Sunlight. Light is measured in Lumens, the Sun emits anywhere from 32,000 and 100,000 lumens per square meter (depending on the location). A typical grow light (High Pressure Sodium / Metal Halide) produces around 50,000 lumens per square foot. In peak conditions, the Sun can double the lumens of any grow light. Also, grow lights arent well rounded in spectrums, Metal halides emit mostly a blue spectrum while High Pressure Sodium Lamps emit mostly red spectrum. The sun is well rounded on both spectrums. The other lights you mentioned cannot be used to grow plants to potential.

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