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During the flowering period, fast growing plants function best at a light level of at least 40,000 lumens per  m².

Quantities of light exceeding 50,000 lumens per m² are a waste of energy.

About 75 - 80% of the number of a lamps lumen output are actually available.

For example : an AGRO lamp produces 52,000 lumens.

This actually means 80% x 52,000 = 44,000 lumens.

This means that one 400W lamp produces enough light for one m².

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