The switchable blue 450Nm added on many newer quantum boards is just one of the recent 'improvements' but as mentioned above, the 5000K white light in the Vipar is considered more blue and the 3000k more red. Using 3000k + 5000k in equal basically equates to 4000k.
The 450 blue is said to be able to control stretch and penetrates deeper into the leaf than white light
The majority of old blurples used 470Nm blues and 630Nm reds. Mainly due to price, infomation and technology.
The 450 royal blues are the next step up from the voilet UVa's on the visible light spectrum. Not good for the eyes!
One can only imagine the precise growth control that may be available, with the next evolution of grow light tech. Light emitting diodes are ancient techology really. Only so much further to take it.
It seems inevitable that the majority of the 1st worlds food crops will grown indoors either under artificial light or with highly sophisticated enviroment filters/systems within the next 50-100 years. Led's will soon be replaced by even better tech. Plasma re-invented, Lasers?