Date: Fri, 14 Jan 2000 17:17:18 +1100 From: "Richard Jobson" <r.jobson@botany.uq.edu.au> To: cp@opus.hpl.hp.com Message-Id: <aabcdefg119$foo@default> Subject: light meter
Zachary,
A lux = 1 lumen per square meter. A footcandle = 1 lumen per
square foot. Therefore 1 foot candle = 10.7 lux and is a measure of
illumination.
Someone with a physics background may need to correct me but a
lux meter measures luminosity and is not very useful in
determining available light levels in relation to plant growth. A meter
that measures in Micro-Einsteins (micro mole/meter/second) is
probably best because it can measure the specific radiation
utilized by the plants. One model is the Li-Cor quantum meter LI-
189 - not sure on the price - it may be expensive?
However, if you just want a rough idea of light levels in your growing
area rather than the levels of available energy hitting your plants, a
lux meter is probably sufficient. Depends on your intended
application.
Hope I've helped a bit,
Richard.
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