Old T5 Flourecent Fixture-Replace with LED Gro Lights or Buy Entire Fixture

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I am of the opinion that if a grow light or bulb maker does not report a PPFD value, you are left to guess on the suitability of the product. Remember that brightness, as perceived by the human eye, is not relevant when looking for a grow light. Knowing the spectral output would be helpful, but the PPFD is key, and the value is dependent upon the distance from the light source.