I've asked the staff from VG regarding your suggestion, here's what his reply is:
Herbs can be grown on the vertical garden, but limited selections only
The Red/Blue lights (he referred to them as UV lights) are quite glaring to the eyes and will cast a pink shade on the green wall and will not make it look beautiful
He still would recommend growing herbs in pots with natural sunlight.
I think the vertical garden should be seen as a decorative element to the house, so no herbs on it! That's where the Smart Garden comes in!