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Hi Geoff,
Going for bulbs as white as possible is safest. The spectral response of your camera/filters will have an effect on what colour the flats end up. Most one-shot cameras aim at a white balance that shows white as white. i.e. even amounts of R,G and B where the colour is white. The interior of the box should also be white as well as the diffuser. The aim being to get an evenly distributed flat white light source to calibrate with.
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