Currently trying to use this light on its blue setting to grow chaetomorpha. Already had the light so I figured its worth a shot and fits nicely mounted on the sump but I see a lot of red light spectrum in refuge lights so not sure if its a necessity or just better for growing. I know its better in general just trying to hold out for an upgrade and if it works for now ill save for a better light. If it grows with just the blue light I'm fine with it until I upgrade but if it needs that red spectrum in the 660 range to grow at all I have a cheaper light in mind. Open to hearing personal experience with cheap or alternative lights for a refuge and would prefer to avoid full spectrum since its in my bedroom and exposed. (Personally i think the blue is pleasant so i don't mind that.)