When I do this with a Project STAR spectrometer and my cameras and point it to a candle I get two distinct dips in the spectral distribution. It should be even like a blackbody. I have made a parser for the RGB-picture to turn it to a B&W power distribution and I thought I'd might do a simple software filter to make it completely even, like a calibration of sorts. Like so: http://www.flickr.com/photos/defdac/7874867702/in/photostrea... I use the power distributions coupled with lumen and wattage-specification as input for my home made spectrally based global illumination renderer to calculate PAR in aquariums. Do you think this will work?