i don't think it's fair to say coverage is pathetic or to compare them directly to MH as they aren't intended to replace MH over larger tanks. LED's can produce performance equal to MH over a small area which is why you need a large array of LEDs to cover a larger tank (I'm using 80 LEDs to cover my 48"x18" 75 gallon). But for nano tanks or spotlighting these Par38 type bulbs are a great option.
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