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How can you tell actual wattage?

You can always drop them a little bit, give it a day or two then drop them a little more. This is a safe way to get them down without burning your plants and would be my suggestion.
The page with your lights states 8 to 12 inchs I'd be skeptical about that. bring the LED lights to 14 inchs and hold a day or two.
Here is a link to mill over, maybe it can help you with understanding the complicated math behind
LUX, lumens, Par........
https://www.apogeeinstruments.com/conversion-ppfd-to-lux/
 
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