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6) What is the typical lumen (PPF) maintenance?

The lumen (PPF) output of an Inda-Gro induction lamp is expected to have depreciated after 100,000 hours to no less than 70% of the initial rated output. When any lamp is new, its light output is at the maximum. As the lamp operates, various processes (plasma, chemical, and thermal) within the lamp causes a gradual reduction of its lumen output. The degree to which the actual light out put decreases with operating time is referred to as lumen maintenance.

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Blending the Art and Science of Indoor Gardening

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