Ack, been out of town for a while now. This is the first time I've run through the forums looking for threads to post in. :3
I have a custom spectrum COB from VanQ. Nothing to complain about here, my largest issue has been heat issues on the RP lens (which has nothing to do with VanQ) which I'll have to eventually rectify. I'm still in touch with those guys and they ask me tons of questions, mostly about veg/bloom spectrums. They've sold a few lights per my recommended bloom spectrum, one to a guy in Spain and one to a guy in the UK and we're waiting to see what they have to say about the light in a full cycle setting. Recently I got an email from them and they just found out that their bloom spectrums had enough Blue in them to veg MJ plants perfectly well. I had been telling them this for a month!
So, basically what I'm saying is they can build a COB per your requirements perfectly well, I can recommend them in that regard without hesitation. However, MJ is illegal where they are so they are relying on customers to test their products and report back with results and/or constructive criticism. While their spectrums will grow plants, I wouldn't take their word that one of their ratios is exactly what you need for mmj. Take the research/knowledge that you've accumulated and apply that to a custom COB that they can build for you (if you're even still interested).
And if you do buy something from them, I'd love to hear about it!