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Level of light is determined by PAR, not Watts Per Gallon, which is outtdated and not applicable to modern lighting. So WPG isn't really a thing anymore, unfortunately.

Take a look at the sticky in the Lighting section and you'll get a quick primer. It's not difficult to comprehend. And the fixture and bulbs you're using are likely already tested so you can find out easily what level of lighting you have.
 
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