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@Growin_it, hi. The manufacturer claims (for one light): 238 μmol/s/m2 average @ 15 cm distance. One light is made for an area of 60 cm x 40 cm. Ordered the lights from France, since prices skyrocketed due to legalization in Germany. [...] ... we'll see how good they are. So far I would say ... that they work : ) .