Spectral lightmeter Gigahertz-Optik MSC15
- Thread starter Malocan
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Malocan
Well-Known Member
yea i think soSo I was right with the sun in the southern sky being the reason?
JorgeGonzales
Well-Known Member
Use this one. I have to believe it's pretty accurate. Apogee set it up expressly to calibrate their quantum meters.
http://clearskycalculator.com/quantumsensor.htm
Assuming I have the inputs right (I just used Berlin, since I don't know your exact location), your measurement was close to what it predicts for noon. The brightest light is actually later in the afternoon. They also show the sensitivity to various parameters:
http://clearskycalculator.com/model_accuracyPPF.htm
It's actually a pretty great site.
http://clearskycalculator.com/quantumsensor.htm
Assuming I have the inputs right (I just used Berlin, since I don't know your exact location), your measurement was close to what it predicts for noon. The brightest light is actually later in the afternoon. They also show the sensitivity to various parameters:
http://clearskycalculator.com/model_accuracyPPF.htm
It's actually a pretty great site.
robincnn
Well-Known Member
@Rahz
You guys may find some info in this thread.
Note that 90 CRI cobs show up as 95 CRI under test.
80 CRI cobs show up as 85-87 CRI under test
Here is 3000K 90 CRI Vero 29 test with Lighting Passport. Vero 29 SE so its Gen 7
Raw data attached
who ever requested the data can check the Math Vero 29 3000K 90 CRI.zip for accuracy
Here is 1818 90 CRI just for comparison
CobKits
Well-Known Member
per datasheet thats usually a minimum spec.
i recall them being higher with the uprtek but not by that much, usually 2-3 points
Rahz
Well-Known Member
Thanks for those results. It seems to indicate a very similar electrical efficiency, about a percent or two less at 45w than the 80CRI result. Seems like a good deal to get the extra red in there.
That's similar to the 1212 comparative results @MeGaKiLlErMaN posted https://www.rollitup.org/t/cob-spectral-quality-thread.936127/page-2#post-13407260.
That's similar to the 1212 comparative results @MeGaKiLlErMaN posted https://www.rollitup.org/t/cob-spectral-quality-thread.936127/page-2#post-13407260.
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