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Hi Erik. The 2nd method you mentioned seems reasonable. Another alternative we used to use for calibrating spectroradiometers is to use a D65 lamp from an Over Head Projector (OHP). These are designed to mimic the sun's colour at 6500K. Imaging the light produced by these on a spectrally flat surface (PTFE/Teflon) should give you a decent colour balance.
Cheers,
Cam
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