True wattage is 340

marcd455 said:

Curious how you would ballpark a reading? I've side by side tested a few similar LED's of the same wattage and achieved PPFD readings with a 300 variance.

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So for eg, a Mars hydro TS2000 which is of average efficiency is 300watts. At 18 inches from the canopy will average 1000PPFD. Factor in the fact he said he’s running a 20/4. So, 1000x60x60x20/1000000= 72DLI! Now, I know there are many variables like efficiency, reflection etc but as a “ballpark” this is still way too much light even if it’s low efficiency he will still surpass DLI.