It's true what
@massivetids says. But measuring light intensity in lux is outdated, as it doesn't indicate the density of photons. This is much more important for the plant than the pure light intensity in lux. Google it for more information. The PPF value is crucial here. For almost every manufacturer, there are tables available online. Search for "lamp + ppfd map."
150 - 300 ppfd -> Seedling
400 - 600 ppfd -> Veg
600 - 1000 ppfd -> Flowering