Originally Posted by Mr. D
I don't quit understand the question but it was explained to me as like 54wts of LED
is equal to a 250wts metal halide.. But only in the squar fixtures like Inovative marines as an example
All LEDs are not created equal. Just because a fixture has LEDs in it does not mean that it will support photosynthetic creatures.
There are many variables to think about. The depth of the tank, top to bottom is a more important factor than how many total gallons it is.
The wattage of the Lighting, the efficiency per watt, reflectors/optics, and finally what livestock you intend to keep, must all be considered when choosing lighting.