Yeah, wouldn't recommend doing that. You're still going to get an okay yield off 5000K. Viparspectras have a similar spectrum really. Or at least the blue and red ratio's. They still get you end product.
And tbh, I know nothing about those particular CREE's but if they were that cheap.... Idk
My lights will definitely be built around that Kelvin but that's not the only Kelvin I'm going to use. I'm going to mix it up a lil. Keep in mind,I'm growing exactly like DS...ill have a 400w MH/HPS in with the COBs depending on which growth cycle I'm on.