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Re: [APD] lighting temperature question

> Why reef light is blue -- Is it refraction that causes the
> deeper reef lighting to be blue? I believe it is due mainly
> to the higher energy end of the spectrum (blue) being able
> to penetrate farther into the water before being absorbed.
> It's not the Rayleigh effect, which makes the sky blue,
> where the shorter wavelengths are scattered more.
That is actually exactly why it is blue. Longer wavelengths of reds etc. 
dissipate and shorter wavelengths of blue scatter the further down you go.
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