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Old 03-17-2013, 11:42 PM   #31
m00se
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I just tested it in Google Docs and it works. Make a new spreadsheet in GD and then go to File/Import and choose "New Spreadsheet" and point it to the xls file. It will upload it then you'll be good.

HTH

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Old 03-18-2013, 03:32 PM   #32
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Is there a direct relationship between Lumen and PAR? I am not an expert, but I thought they are two different units, and things like spectrum play a role? Like having two LEDs with the same luminous flow, one with peaks in the yellow/green area, another one more in the red/blue photosynthetically speaking more significant area ?
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Old 03-18-2013, 03:39 PM   #33
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Quote:
Originally Posted by Wasserpest View Post
Is there a direct relationship between Lumen and PAR? I am not an expert, but I thought they are two different units, and things like spectrum play a role? Like having two LEDs with the same luminous flow, one with peaks in the yellow/green area, another one more in the red/blue photosynthetically speaking more significant area ?
Yes on all the questions. On Apogee's site there is a lumens to par conversion equation. There is a relationship but it's an approximation for white sun light. A par sensor will have a peak toward the blue.
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Old 05-01-2014, 04:36 AM   #34
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Comparison of LUX and PAR output for single colour LEDnm. Cyan, green, yellow LEDs have high LUX but low PAR while blues and reds have low LUX and high PAR. PAR graph shows the problem called the green valley issue in LED manufacturing
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Old 05-01-2014, 04:32 PM   #35
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With a PC I think you do need to have Excel or Office installed to make the spreadsheet work. Without it, it is just a table in a document.
FYI for those not tethered to MS "Openoffice" Calc opens it just fine.. and that is free..
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