The light is two months old. It's an undercabinet mount. Though, maybe the glass has an algae film that is impeding light transfer. It's hard for me to see back there.
i have coralline algae sites that seem to be blooming. Otherwise, i do have little algae. I had a breakout of hair algae about 3-4 weeks ago but it is all gone now. In fact, it appears so pristine that I've started feeding my CuC with strips of nori for fear of starvation.