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My fixture is rated @ 20,000 lumens putting it @ 2,500 lumens a square foot. I know lumens isn't the proper measurement for photosynthesis measureplment but I thought it might be a way to ball park my lighting capability.
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Lumins are a perfectly fine measurement of light ought-put for comparison. However you can't compare the lumen output of HID to that of florescent lighting, because the lumen drop off is far greater with florescent
lights than it is with HID. The lumen rating is what the lumen output is at the
bulbs surface. the farther away from the bulb you get the less lumin output your actually getting. That number drops significantly faster with florescent lights. It works the same using par for measuring light output. Par drops significantly faster with florescent lights as well.