You don't mean the unit of spectral radiance reported by the EyeOnePro in emissive mode, do you? Because I once asked the question to GretagMacbeth and I was told microwatts/cm2/nm or mw/cm2/nm. It took a lot of correspondence to get a firm answer to this one.
Yes, that's the type of thing. The above aren't equivalent though, milliwatts being 1000 times bigger than microwatts (uW). The closest to KW/m^2/nm might be mW/mm^2/nm. Graeme Gill.