I was tasked with reproducing the colours of two wratten filters on a digitally controlled led-lamp with a 8 bit colour scale. What I did was the following: The manual for the lamp stated its colourtemperature, 6500k, so I set my em5 accordingly. Took my OM90mm macro, a lens as far as I can tell, is neutral in colourrendering, and placed one the filters in between it and the lamp set to produce white, defocusing to blend its three (rgb) diodes. The image was imported as raw, with wb untouched, and I used the colour-measuring tool in OSX. That gave me an rgb value. Plotted this value into the lamp's UI and voila! The same colour. Or is it? It seemed a bit lighter than the filter's, not as saturated maybe. And I'm not sure if the colour I came up with is the same wavelength. Does anyone know a way to check the colour, or see any flaws to my method? Any input appreciated.