Are you saying leave both veg and bloom on the entire grow or just during flower for autos? I just started my first set of autos and only have the veg on. Am I doing it wrong?
Manufacturers, such as Viparspectra, recommend just veg initially, then near flowering turning on bloom while keeping veg on as well. I'm only just finishing my first grow, but have run full spectrum the entire time. The extra light can't hurt unless it's too close, and even if parts of the spectrum are less useful at different points in the cycle, there is bound to still be some benefit from the extra light.