Why do LED grow lights cover a smaller grow area during flowering?
When flowering, PLANTis usually grown on a cycle of 12 hours of light, 12 of darkness. Whereas during veg it’s receiving light for up to 18 hours a day. So, to compensate for fewer hours of “daytime” during flowering, the light is usually lowered closer to the plants to maximize the quantity of light falling on the plants. (You could also add another light, but for most people lowering the light is the best solution.)
So make sure to buy a light that can comfortably cover your grow area for flowering, not just at the veg stage.