I have seen a couple studies that show having/adding deep red is an important part of LED lighting because deep red penetrates your skin the deepest and is used as a signal to your body that it is receiving light/sun.

Personally if I wanted "daylight" replicated by LEDs I would go for a higher quality white grow light that included deep red LEDs. Just be sure you don't get one that is also outputting in the UV range, although most don't.