I've done a lot of experimenting with different types of LED's used for anything from houseplants to reef tanks, and results are as frustrating as they are varied. If it was just a case of throwing lots of royal blue and orange-red light on plants we'd be all set with LED's, but it's more complicated than that. Full spectrum light sources have their advocates, and the truth is that not everything responds to a light source dominated by 450nm and 625nm wavelengths. Plants don't read Wikipedia articles and white papers about in-vitro chlorophyll absorption.
After looking back at some of my own growth tests I'm drawing to a frustrating conclusion that 470nm-475 blue might actually work better than 450nm or even white LED light for vegetative growth. Good luck finding a white LED that's not anemic in that wavelength.
It sounds like WeLight is approaching this from the 'full spectrum' angle, and also will have the ability to tune the light source as a by product. You can't do the later with a full spectrum T5 or Halide, and I don't think his goal is to light acres of green houses.