Not sure of the math but I had about 17 liters of grow medium, 2w of air pumps, and 50w of leds 24/7 and was producing a shocking amount of biomass.

Also, fresh spirulina is most comparable to tofu. Very little flavor, gag-worthy sponge-like texture. Was trying to make fish feed but had to eat most of it myself as the fish and the dog wouldn’t touch it.

Shut down the operation after a few harvests. Mine was kept warm by sitting on top of a water reservoir that water cooled other grow lights for my main indoor garden, but keeping it warm would be the major cost in most climates, as it grows best in 90 deg F water.