Re: Re: lighting -- or - color vs intensity

["Giancarlo" <gp at isaconsulting_com>]

Sorry for the confusion Scott, I should have started a new sentence. My
statement "That's a lot of light" was related to Keith's tank which has 192W
over a 30 gallons. I wasn't trying to say that the 10000K bulb is a lot of
light, actually I feel the opposite is closer to the truth, comparing the
two bulbs (10000K and 6700K) in my tank, the 67000 appears to illuminate the
tank a lot more. The 10000K just gives me the colder lighting I prefer.

Sorry for the confusion everyone.

Giancarlo Podio

----- Original Message -----

  a.. To: Aquatic-Plants at actwin_com
  b.. Subject: Re: lighting -- or - color vs intensity
  c.. From: "S. Hieber" <shieber at yahoo_com>
  d.. Date: Sat, 2 Nov 2002 06:32:55 -0800 (PST)
  e.. In-reply-to: <200211021119.gA2BJm32030739 at mailhub_actwin.com>

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----

I'm sure Giancarlo knows what he meant when he said:

&gt; I wouldn't throw it out, I have a 10000K along with
two
&gt; 6700K bulbs and am
&gt; happy with it. I like the cooler tones but I wouldn't
use
&gt; a 10000K on it's
&gt; own. That's a lot of light!


But it might be confusing to the the newer hobbyists.  It
sounds like he's saying that, in general, a bulb rated with
a higher color temperature gives off more light.  The
amount of light has no direct relationship to the average
value of the spectrum or the color temperature.  How much
light is one thing, what parts of the spectrum make up that
light is another.  A blue bulb can be dimmer than a red
bulb and vice versa.

While it's true that photons at the blue end of the
spectrum have a higher energy level than ones at the red
end, the energy level of the photons doesn't translate into
light intensity.  For that you have to know how many
photons or an ersatz measurement, lumens.

And of course, if you can't get you hands on lumens, then
watts is a handy (albeit poor) ersatz for lumens.

Scott H.