Il 05/11/2010 00:55, Graeme Gill ha scritto: > * very low level (not much light - practically zero) I know, the lamp was quite far. > what sort illuminant is it ? A tungsten lamp. I did one more test with a energy saving lamp which is very close to the pc, so the level should be very high. Here is the illuminant spectrum plot: http://darkbasic.homelinux.com/images/energy_saving_lamp_plot.png And here are the spectral readings: http://darkbasic.homelinux.com/images/energy_saving_lamp.zip Same problems: strange temperature, completely different colors with spec2cie. Thank you, Darkbasic