Spectral lightmeter Gigahertz-Optik MSC15
- Thread starter Malocan
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- spectral lightmeter
JorgeGonzales
Well-Known Member
Hah.
JorgeGonzales
Well-Known Member
Malocan can you share the raw PPFD data like the original test? Or just do a sum and divide on the spreadsheet for the PPFD data.
Something like =SUM(C3:C123)/121 should do it!
Something like =SUM(C3:C123)/121 should do it!
Malocan
Well-Known Member
oh okey thanks for the math, i will do it now
edit: PPFD is now in title, thanks jorge
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guod
Well-Known Member
JorgeGonzales
Well-Known Member
How do we better compare without averaging the PPFD? You skipped that part
guod
Well-Known Member
a solution can be found in the
http://www.cree.com/~/media/Files/C...Designs/HorticultureReferenceDesign.pdf?la=en
PPFC Uniformity along with PPFD
a PPFD Uniformity above 80% is my target
http://www.cree.com/~/media/Files/C...Designs/HorticultureReferenceDesign.pdf?la=en
PPFC Uniformity along with PPFD
a PPFD Uniformity above 80% is my target
JorgeGonzales
Well-Known Member
But they also use average PPFD? Changing height or reflectors means more loss due to reflections off the wall instead of heading straight to the canopy, yeah? That's all I thought we were comparing with summing the spot measurements.
But PPFD uniformity seems like a separate metric that goes hand in hand with PPFD measurements. They both matter, is that you were saying? I mean we have the colored footprints, but min/max is a nice way to cut through the bullshit. Thanks.
JorgeGonzales
Well-Known Member
Although then my question is, which is better? Not a new question, maybe, since it was kind of obvious looking at the footprints:
60CM no reflector:
AVG PPFD: 596
PPFD min/max: .55. << better than Cree/Gavita, but in a tent!
60CM w/reflector:
AVG PPFD: 629
PPFD min/max: .42
?
60CM no reflector:
AVG PPFD: 596
PPFD min/max: .55. << better than Cree/Gavita, but in a tent!
60CM w/reflector:
AVG PPFD: 629
PPFD min/max: .42
?
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robincnn
Well-Known Member
Better than Cree.. not fair . their test was not in tent.
The gain with reflectors is small but still 10%
The gain would be much more if the the test was done outside tent.
Thanks for the data guys. canopy is not reflective. Do you think the results would change if the base of the tent was not reflective. I threw in a green cloth when i took my measurements.
The gain with reflectors is small but still 10%
The gain would be much more if the the test was done outside tent.
Thanks for the data guys. canopy is not reflective. Do you think the results would change if the base of the tent was not reflective. I threw in a green cloth when i took my measurements.
JorgeGonzales
Well-Known Member
I bet it changes PPFD, but not uniformity. That's my story and I'm sticking to it.
Malocan
Well-Known Member
in future i will do the same, thanks for the tip.
Malocan
Well-Known Member
Hi Guod,
how we could achieve such a good PPFD Uniformity, i cant imagine how to got 80%.
Maybe with many light sources, which are running on their own driver to dimm them up or down to achieve a even spread
JorgeGonzales
Well-Known Member
Maybe raise only the cobs in the center? For example with 5x5 cobs raise the center 9 cobs. Or with 4x4 cobs raise the center 4cobs. Probably won't be 80% but looking at your footprint pics, raising a few cobs in the center will lower the ppf in the center and spread the light out more to the sides. Or maybe just spread the ones in the center more. Or yes, dim the center cobs, or run the ones around the edges harder.Hi Guod,
how we could achieve such a good PPFD Uniformity, i cant imagine how to got 80%.
Maybe with many light sources, which are running on their own driver to dimm them up or down to achieve a even spread
Airwalker16
Well-Known Member
OoOoOoOoOoOo... 2700K, eh?!?! Do you plan on using this 5 cob light to flower mr, malocan?
Malocan
Well-Known Member
Hello Airwalker16,
yes
its my Indicalight. I have some indica phenos, they are short as hell. Maybe i can animate them to strech a bit.
JorgeGonzales
Well-Known Member
I guess the no-reflector tests weren't so bad after all, with those beasts ready to be built. What are the rest of the holders for?