LED source

Mike Clearwater MIKEC at srv0.bio.ed.ac.uk
Tue Nov 12 10:22:17 EST 1996


As far as I know the Quantum devices QBEAM light sources are still 
available, they are made especially for the 1/4 litre chambers of the 
LI COR 6200 photosynthesis system, with an adaptor that allow it to 
be used with the 1 litre chambers as well.  I have found it an 
excellent cool light source, especially useful for the closed 6200 
system and in hot climate where overheating of the leaf and chamber 
is a problem. These LED light sources 
can produce high intensities because the LED chips are mounted 
directly on a ceramic board  (good heat sink), rather than inside the usual 
plastic housing.  If you push a normal high intensity LED too far it is 
liable to pop?

However, if you only need 100 micro mol m-2 s-1at a distance of 2 - 3 
cm (e.g. through the lid of a licor chamber), you should be able to 
make your own array from relatively cheap high intensity LEDs.

Mike
===============================================
Mike Clearwater
Institute of Ecology and Resource Management
University of Edinburgh
Edinburgh EH9 3JU
UK

Ph +44-131-650-5423
Fax +44-131-662-0478
e-mail:  m.clearwater at ed.ac.uk





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