We tested a Finnex Ray II, 16 inch light, at our local aquatic plant club meeting 2 days ago. It was very impressive, especially because of the very wide spread of the light with little PAR reduction. We measured about 22 micromols of PAR (low light) at about 24 inches from the light. That makes it a great choice for low light, low tech tanks, even high tanks. The PAR readings in Finnex RAY II & FugeRAY PAR Data
can be trusted.