Re: NANFA-L-- spiral strip

Bill Flowers (billflower-in-gmail.com)
Fri, 31 Mar 2006 16:08:54 -0500

On 3/31/06, Jerry Baker <nanfa-in-bakerweb.biz> wrote:
>
> Todd D. Crail wrote:
> > They can have the same luminosity as a "less efficient" bulb, but (and
> this
> > is of note) offer absolutely nothing to photosynthetic
> organisms. That's
> > why the spirals work great over fish tanks, as they have very little PAR
> to
> > offer to algae, but don't expect much of them for plants.
>
> Just a minor niggle: Daylight bulbs will have much more blue in them
> than regular cool white or warm white bulbs. They will appear more dim
> to us and brighter to plants (chlorophyll's peak absorption of light is
> in the blue - 445um). That's why grow lights look so dim compared to a
> regular light. PAR is just a measurement of the actual number of photons
> occurring between the blue and red spectrum (sometimes referred to as
> photosynthetic photon flux density). If you are using daylight spirals
> over a tank you will be offering more PAR than if you use warm white or
> cool white bulbs because the latter have almost all of their light
> output concentrated in the yellow-green area of the spectrum - the least
> usable to chlorophyll.
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Thank you for clearing some of that up. It was interesting.
Now where did I put those Excedrins..........

--
  Bill Flowers
The Fish Addict
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/ visit http://www.nanfa.org Please make sure all posts to nanfa-l are
/ consistent with the guidelines as per
/ http://www.nanfa.org/guidelines.shtml To subscribe, unsubscribe, or get
/ help, visit the NANFA email list home page and archive at
/ http://www.nanfa.org/email.shtml