HighOnDIYLife
Active Member
Can't wait to see the results
CRI test and Mcree weighted results
- Thread starter Rahz
- Start date
puffenuff
Well-Known Member
How is this being gauged?
Rahz
Well-Known Member
Ripeness? Just by appearance. The 3000/70 was the last to show red stigmas. The 3000/80 is in between the two high CRIs so that could be the reason it's finishing as quick as they are. Keep in mind the veg time was accidentally extended and the lamps ended up being raised above the partitions. None of the figures will be exact representations but I will publish them for examination.
BuddyColas
Well-Known Member
I second that. Good on ya Rahz. My take aways thus far are that the "Emerson Effect" with the increased rate of photosynthesis is clear and observable. I think the plants under the 90 cri could have been put into flower soon...saving both time and money on the power.
And doing the math, the 80 and 90 cri cobs put down about the same number of photons. It's just that some of the 90 cri cobs photons are out of the traditional PAR spectrum. Turns out the lie right in the Emerson Effect spectrum!
Great thread.
Nenno44
Well-Known Member
This isn't scientific at all but I have noticed with my grows that adding some 2700k 90cri to my 3500 80cri did speed up my time a little. Then I got a little more speed by adding 730nm at lights out. This first grow finished 9 days faster under this new set up. Second grow just started. Sorry not trying to hijack. I am very excited to see the results Rahz gets with his tests.
Rahz
Well-Known Member
I don't know yet, but I'm told the tall plants had bushed out and were shading the 3000K 70 and 80 CRI samples so I don't think the weight will be relevant at all. The 3500/80 was not shaded and I'm told it's not going to be the best of the bunch so that is something worth considering.
The tester is willing to do a second run so there will be another test with proper controls.
cdgmoney250
Well-Known Member
I've read a few studies that have found light wavelengths of >780nm will elicit photosynthesis and stimulate photosystems 1 & 2, with most activity dropping off sharply <740nm.
http://www.sciencedirect.com/science/article/pii/S0005272805001192
Nenno44
Well-Known Member
it should be ready to be weighed in a day or two and as far as quality it looks great. But I won't know for sure until some one tries it and reports back.(I don't use cannabis myself)
BuddyColas
Well-Known Member
OK, but how do you explain the rather large difference between the plants under the 90 cri cobs and the others?
wietefras
Well-Known Member
Then why do you post two charts showing that the quantum yield drops to zero right around 700Nm?
Just to be clear, you need to look at the circles and diamonds. The solid and dashed lines are absorptance figures which just mean it doesn't get reflected. The circles and diamonds show if the plant actually does something with the light and that plummets to close to 0.
Stephenj37826
Well-Known Member
Photosynthesis is at 10% @ 710nm and 1% @ 720nm when used alone.
But...... When used in conjunction with 650-660nm....... Those wavelengths are more effective.
Last edited:
cdgmoney250
Well-Known Member
I guess we have different ideas of what 0 means.
I won't try to convince you, maybe just read the article cited? They do a much better job at explaining than I could.
BuddyColas
Well-Known Member
So you're saying 9 days shorter flower time with a strain you have grown before under the new light setup? That's huge on say a typical 8 week or so flower time. And it would shorten your veg time as well.
I read a lot, but I also put a lot of weight in personal observation in the garden!
Last edited:
Nenno44
Well-Known Member
yes I have grow this before. And to be fare it has almost always been like 10 weeks on the dot until this last run
BuddyColas
Well-Known Member
Sweet! I like that you have multiple grows of the same strain to compare. Who knows, maybe 8 weeks and change will be the new normal!
captainmorgan
Well-Known Member
Using 730 nm for 5 min after lights out takes at least a week off every strain I've run. Using 730nm during lights out for a few hours will stretch a plant out and too much during lights on will do the same. I've been using 730nm for about 3 years if I remember right.