Date: Sat, 15 Jan 2000 16:28:40 +1000 From: "Richard Jobson" <r.jobson@botany.uq.edu.au> To: cp@opus.hpl.hp.com Message-Id: <aabcdefg130$foo@default> Subject: more light meter stuff
Zachary,
Just to sum up the responses to your question on which meter to
purchase - the lux meter measures luminosity - radiation as your
eyes see it.
While a quantum sensor measures photosynthetically active
radiation in the 400 to 700 waveband - that which a plant actually
uses to photosynthesise. You could refer to Li-Cors home page at
http://env.licor.com/products/sensors/quan.htm
Your questions 2 and 3 could possibly be answered by a
photographer, but my guess is that 50,000 lux is greater than the
luminosity of outside on a day in full sun. And that the relative
sensitivity is the angle (10-100 degrees) at which light can be
registered by the sensor surface. Best bet is to ask the distributer.
Cheers,
Richard "the physics flop"
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