Correction: Re: UV-B, Anthocyanins and high kelvin bulbs

[Wright Huntley <jwwiii at pacbell_net>]

> Date: Mon, 16 Sep 2002 15:14:06 +0200
> From: "Daniel Larsson" <defdac at hotmail_com>
> Subject: Re: UV-B, Anthocyanins and high kelvin bulbs
> 
> Oops. Sorry. Blue light (longer wave length) has *less*
> energy than red light (shorter wave length). The damping
> effect from the water is greater on shorter wave lengths.
> (That's why the water gets more blue at greater depths)

...Quite the opposite. Blue light has a wavelength of about 450nm and 
red is more like 670 nm -- that is, much longer.

The energy per photon is *higher* in blue light than in red. Deeper 
water gets blue because water absorbs very slightly more in the red end 
of the spectrum. There is little direct relationship, here, between 
energy and absorption.

Just felt that needed straightening out before it got into aquarium 
mythology. :-)

Wright

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