linky
Well-Known Member
Yeah, I understand that and I agree.. I just wanted a nice toy that would give pretty accurate numbers, I think I will order the apogee 500 meter they have for 500 bucks.
Par meter and ppfd questions
- Thread starter linky
- Start date
Yeah, I understand that and I agree.. I just wanted a nice toy that would give pretty accurate numbers, I think I will order the apogee 500 meter they have for 500 bucks.
1KTrees
Member
I see it says one is 90 cri and one is 80 cri, but what chips are they?Just Like My Yardage Reader My Apogee MQ-200 Is An Important Tool In Da Dawgs House
90 CRI
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80 CRI
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And Now The VooDoo Children 90 CRI On the Left And The 80 Cri On The Right
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CobKits
Well-Known Member
BuddyColas
Well-Known Member
So what K and CRI cobs are you trying to measure?
linky
Well-Known Member
looking to measure the gavitas, cmh 630 watt de fixtures, cree 3590 fixtures and vero 29 fixtures. crees are 3500k 80 cri and veros are 3000k mostly 80 cri and some 90 cri now. Ordered parts to build 2 more of these lights in this thread, ordered black 8020 this time though
. I went with 5 3000k 80 cri and 5 90 cri instead of 6 and 4 this time.
BuddyColas
Well-Known Member
Quite a variety. Interestingly I looked at the 3000/90 curve on the Cititzen 1212 on Cobkits site. It is interesting to me to count all the squares below 660nm, then count all the squares above 660nm which are not counted with the 120. Now admittedly this is not exact, but it looks to me like at least 20% of the total photons are not counted. So your 650 umols is really significantly higher. I hope Apogee comes through with some accurate multipliers for the warm cobs. I'll be watching your thread!looking to measure the gavitas, cmh 630 watt de fixtures, cree 3590 fixtures and vero 29 fixtures. crees are 3500k 80 cri and veros are 3000k mostly 80 cri and some 90 cri now. Ordered parts to build 2 more of these lights in this thread, ordered black 8020 this time though
BuddyColas
Well-Known Member
There are guys here who can generate, a "spectral curve of your light in spreadsheet format with the intensity at each wavelength." But I'm not one of them.
Check out this thread:
https://www.rollitup.org/t/cob-efficiency-spreadsheets.865238/page-3
You could PM Alesh...he is one of the guys who can generate the spectral curves in spreadsheet format. Or he might tell you who to talk to. Just don't pitch your 120 just yet.
wietefras
Well-Known Member
There is a thread here which lists several conversion factors. Look up the lux to par conversion factor for the specific spectral distribution of your light.
Or in general, for 3000K 80 CRI COBs it will be somewhere around 67 to 69 and for 3000K 90 CRI around 57. Divide the lux by that factor and you get PAR.
Or in general, for 3000K 80 CRI COBs it will be somewhere around 67 to 69 and for 3000K 90 CRI around 57. Divide the lux by that factor and you get PAR.
KonopCh
Well-Known Member
Okay, thanks!
But another question is... what's optimal? For seedling, for veg, for flower How much PAR? For flower I think 900-1100 is max without CO2, right? What about veg?
CobKits
Well-Known Member
BuddyColas
Well-Known Member
So what did you decide to do with your sq120?
KonopCh
Well-Known Member
So... around 300-400 for veg... And then up to 1000 for flower.
I only have cheap LUX meter, so around 30000-40000 LUX for veg. Cool.