The UV will have a much better effect, the blue CCD may not light up the coolant dye at all.
Green is better because it is a color that is more easily seen than blue and so, appears brighter. Amber also falls in the spectrum of light that the human eye can see very well.
The blue CCD, just like any colored light source will emit light over a broad range of frequencies, but mostly blue. It may dip in the UV spectrum, but it'd be too insignificant to mention.
I'll be using blue UV dye myself, because I prefer a subtle effect. Green is too freaky for my taste...
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