On the one hand I think it's a bit overkill for daytime, but on the other hand they weigh next to nothing, and if they make a slight difference, why not. I tend to use them mostly on dull days (which is quite often in the UK ) or at dusk.

I have these Lezyne lights from Wiggle, they last a long time, and take seconds to switch between bikes.

Wiggle | Lezyne Femto Drive LED Light Set | Light Sets