I'm trying to do some rough figuring to calculating efficiencies of various light sources for growing plants. I'm hampered, however, by the lack of a curve to multiply by the spectrum of light sources to determine the amount of photosynthetically active radiation that a typical plant will absorb and use.

I can find curves like below all over, but I can't get numerical data in the form of tables. Is there some source from where I can get such data?

PAR curve

  • $\begingroup$ plantphysiol.org/content/early/2013/06/28/… is a starting point. He cites a paper of Mcree which may have what you're looking for (pay wall for me). Evans says that photosynthesis for 400-700nm drops off quickly as function of temperature. Red/blue encourage flowering/growth, a gardening truism which may be based on Mcree's paper. $\endgroup$ – daniel May 19 '14 at 20:56
  • $\begingroup$ @daniel your link was cut off $\endgroup$ – Nick T May 19 '14 at 21:16
  • $\begingroup$ This is it---plantphysiol.org/content/early/2013/06/28/… for the standard characters at the beginning ending with the three w's. $\endgroup$ – daniel May 19 '14 at 21:32
  • $\begingroup$ @daniel a safer way to provide links in comments is using markdown, e.g. [Google](http://www.google.com/) = Google. The second link you pasted has a "--except" appended on the end that I had to manually remove. $\endgroup$ – Nick T May 19 '14 at 22:37
  • $\begingroup$ @NickT sorry for the late comment but what do you mean here, by "numerical" $\endgroup$ – WYSIWYG Nov 21 '14 at 18:16

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