Oh sorry, I was confused (thinking of 50w per sq foot HID standard and what it would take in LED to match that for your space) if you're only looking to replace a 600w HID aim for 400w of LED from a good company (actual LED cannabis growers claim up to 30-40% bigger yields watt for watt over HPS even though LED companies often make outrageous claims like their 300w being as good as a 1000w HPS (LED may be way more efficient at producing useable plant light than HID, but you will not get yields that are 3-4x bigger watt for watt than HID like many LED companies claim (when they say things like they're 300w is equal to a 1000w HPS). 3-4x is unrealistic, 1.5 is much more reasonable. If your confident in your ability to grow then you could go with half as many watts of good LED than hps
blah blah blah, 400 total actual watts (even counting fans if you want) of LED from a good company should work as well (if not slightly better) than 600w of HPS depending on how you grow. Also, it would seem watt for watt that LED produces 75% or less heat than HPS
if it were up to me companies would tell you exactly how much wattage the entire unit uses (so you can figure out its operating costs), then they should also tell you how many LEDs are used and what wattage they are run at (or at least the total wattage actually run through the leds). Unfortunately most companies only tell you what the result of the following equation: # of diodes multiplied by their max rating. That is misleading because they can't run them at max
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