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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.
I'm also running my viparspectra with both on for entire grow. Seems to be pretty common.