Yes all of these COB's are 3500K, it's my favorite spectrum to use from Citizen when I need a light that can veg and flower. I will soon be getting more and setting up a larger area to run auto's only on a perpetual basis. I sold the Quantum Boards a while back. Prefer the COB's for the ability to move them around easier, both up and down, and physical placement in the grow. And it's easy to add some or remove some depending what the situation requires. For someone like me running a grow like I do where things are constantly changing the ability to adjust these lights like this is golden. Plus I liked how my plants were growing better with the COB's than the QB's. Not knocking the QB's the Auto cob's just fit me better. Everyone's situation is different.