[Coral-List] PAR logger

Mark Warner mwarner at cms.udel.edu
Fri Jan 26 12:54:27 EST 2007

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/.



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

Phone: 302-645-4365
Fax:  302-645-4028

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