Let's say that both sides get 1 gram per watt (none of our LED journals have hit that yet) for this example.
660 grams LED
750 grams HID
90 grams difference = 3 ounces = ~$300 oz (top shelf here can go for over $500) = $900 dollars difference.
It's unlikely that you'll save $900 over 8-12 weeks of flowering by using LED lights that are still using 660w.
I've done the math plenty of times...
