But did you checked Juhong's lineup? The manufacturer sells small sunlight spectrum COBs too, with 5W and 10W rated power units. These you can run at rated current/power, or half of it for longer life. Could buy a bunch and install them on cheap as chips heatsinks like these, with just 5W or less per emitter your light will be quite evenly spread. The spectrum is also comparatively better to that of high CRI emitters designed for human visual usage.