Ok so honestly those lights will grow a plant, they will flower a plant, they will give you an ok harvest, and that harvest will get you high. But there are FAR better lights, especially COBs.
As for them being COBs, technicaly they are. They are multiple led diode chips wired together on a board, so they are a "chip on board" led. These don't have the phosphor coating most are used to seeing and I'm fairly certain they diode chips they use are not nearly as efficient as almost any other company that does use the phosphor coating.
Personally I just don't understand why they would go with a dual band spectrum, rather than a fuller spectrum. COBs are suppose to be an advance in growing light technology. These seem to be taking a small step back by ignoring the fact that its been proven that plants do use more than just a blue and a red spectrum. To me this is basically just another model of a mars or lush, and will probably perform around the same. Like i said, they will veg, they ill flower and the end product will get you high, but, and with their prices its a big but, there are FAR better options for not a whole lot more.
Oh and building a DIY light isn't as hard as you might think, especially if you go with one of the new mechatronix or similar passive heatsinks that come pre-drilled for most of the commonly used cobs. For what you'd pay for one of these, you could build a light using one of the handful of respectable COBs, a driver or two, cob holders that hold the wire to the cob securely, and predrilled passive heatsinks and maybe a couple wago 222 connectors. Just get the parts together snap some wire connectors with your fingers, cut and strip some wires, line up the cobs, holders and wires in holders, insert and tighten some screws, the only possibility of drilling anything would be to put some holes in the heatsink fins for wire or chain to hold them up. This would also allow you to adjust each light individually for perfect coverage or you could just get some aluminum angle, which is cheap an widely available, to build a frame to hold the heatsinks.
Also 1.75 amp lamps, comparable to 1.4 amp CXB3070 as a percentage of nominal current.
