[Coral-List] PAR logger
rjmiller1 at gmail.com
Mon Jan 29 12:26:05 EST 2007
Check out the self-contained par loggers from Alec Electronics (eg see
available through Rockland Oceanographic, they are a little cheaper than
Li-Cor, especially if you need more than one sensor, and a lot more
convenient for underwater work.
On 1/27/07, Jeremy J. Sofonia <jeremy at sofonia.com> wrote:
> Dear Ian,
> I agree with Mark in his recommendation in the use of the Li-Cor
> brand. I've used these in the past and they have served us well.
> One thing that I would also suggest in regard to your study on the
> effect of sunlight intensity is to include a sensor not only at the
> depth of your subject corals, but also at the surface (i.e. two
> meters). This way, you can assess the initial intensity of light in
> comparison to what is received by your corals and, as such, estimate
> light attenuation through the water column. Obviously, I don't have
> detail on your proposed study, but you may find that this provides
> for more interesting discussion without much additional cost or effort.
> Kind Regards,
> JEREMY J. SOFONIA
> Senior Marine & Environmental Consultant
> SKM Australia Pty. Ltd.
> 7th Floor, Durack Centre
> 263 Adelaide Terrace
> Perth, WA 6000
> On 27/01/2007, at 2:54 AM, Mark Warner wrote:
> > Ian,
> > The HOBO pendant is only good for getting an idea of relative light
> > intensity. Download the manual and you see that the spectral
> > response of the
> > sensor is very heavy in the red and peaks around 900 nm. Thus, this
> > will not
> > give you synonymous values to PAR. For your question, PAR is
> > better, as it
> > is grounded in the wavelength range (400-700 nm) that has biological
> > significance for photosynthetic organisms.
> > Most submersible PAR sensors & loggers are simple, easy to use and
> > reliable,
> > but they are not cheap. For a slightly cheaper alternative to the
> > commonly
> > used Li-Cor brand, have a look here: http://www.apogee-inst.com/.
> > Cheers,
> > Mark
> > coral-list-request at coral.aoml.noaa.gov wrote:
> >> Does anyone know of a simple, easy to use, reliable, submersable
> >> PAR logger?
> >> Or has anyone used the HOBO(r) Pendant 64K Temp/Light Data Logger
> >> to measure
> >> light intensity related to coral bleaching. In general, would light
> >> "intensity" (meaured in lumens) be an appropriate measure of the
> >> effect of
> >> sunlight intensity on corals or is PAR a better method to get at this
> >> question?
> >> All the best,
> >> ian lundgren
> >> Buck Island Reef National Monument
> > -----------------------------------
> > Mark E. Warner
> > Assistant Professor
> > University of Delaware
> > College of Marine and Earth Studies
> > 700 Pilottown Rd.
> > Lewes, DE 19958
> > USA
> > Phone: 302-645-4365
> > Fax: 302-645-4028
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Robert J. Miller, Ph.D.
Santa Barbara Channel LTER
Marine Science Institute
University of California, Santa Barbara
Santa Barbara CA 93106-6150
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