Having not run the expensive stuff, I can't say KB is as good. It certainly works though.
There is quite a bit of speculation regarding spectrum. Most suppliers are not guiding you in any direction. They just offer a range of choices. Others offer lights proven over various crops, so we get the fine tuning a different plant responded to. An example is the 730nm red that supports 660nm red. There is nothing to say cannabis responds favourably to this IR or UV when trialed by leading lighting experts. Some are just impressed with cannabis's reaction to more and more light, while showing little interest in what spectrum. Just as long as it's not damaging.
I suggest you put your money into efficiency, and a spread of light in the visible spectrum. Some of the latest LEDs are becoming more species specific, so watch out for the leafy greens LEDs unless you grow them.
You can use 350-400w a meter and hit the seed packet numbers with KB. That will do for me.