I am struggling with what I think is actually a simple problem. I have an LED that emits infrared light (950 nm). It is part of a sensor system. The manufacturer claims it has a radiant power of 3000 mW/steradian. I want to calculate its total effective radiance as viewed by a human eye. To do so I need to calculate its spectral radiance (L with a subscript '950 nm'). I know that radiance has the units W/steradian/squaremeters (W sr^-1 m^-2), and that it can be expressed per unit wavelength (nm) or frequency (Hz).
I cannot find the algebra form of an equation to convert the information I have (radiant power, 950 nm, 3000 mW/steradian) into spectral radiance. Can someone please help me?