CRI test and Mcree weighted results

captainmorgan said:
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.
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whats up capn

that said we can have the best of both worlds

90cri to get an adequate but not excessive amount of far red for lights on, and then hit it with 730 nm for a short period after hours
 
captainmorgan said:
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.
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I can't remember from the far red thread if you mentioned whether the reduced flowering time also reduced your yield. Could you give us a bit more about that please Captain? I'm not sure I have what it takes to re-read that whole thread :/
 
captainmorgan said:
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.
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I remember you also using 660nm deep red. Have you decided if its worth running additional 660nm with the cobs?
 
DrBlaze said:
I can't remember from the far red thread if you mentioned whether the reduced flowering time also reduced your yield. Could you give us a bit more about that please Captain? I'm not sure I have what it takes to re-read that whole thread :/
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My original reason for using 730 nm as a phytochrome trigger was to increase yield by running a longer light schedule, up to 14/10.

Warpedpassage said:
I remember you also using 660nm deep red. Have you decided if its worth running additional 660nm with the cobs?
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Still experimenting but with my COB panels being set up to maximize efficiency, adding reds actual lowers the overall efficiency.
 
I'd like to see a bunch of side-by-side comparisons of differing amounts of Far Red intensities and durations. I'm sure there will be a huge difference between 100 and 1500 PPFD's of FR
 
TogiX said:
I'd like to see a bunch of side-by-side comparisons of differing amounts of Far Red intensities and durations. I'm sure there will be a huge difference between 100 and 1500 PPFD's of FR
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It's mostly the rratio of FR:R which matters. If you give the plants 1500PPFD of only far red, how much of the rest can you still add?

In sunlight the amount of FR is about equal to same the amount of red light. You already need to add a lot of FR to reach that when using COBs.
 
The yield results for 3000/90 and 2700/90 are in.

3000/90 - 367 grams.
2700/90 - 344 grams.

I've not been getting pictures since I told him I was sure the test needed to be redone, and I haven't pushed it because he wasn't real happy about doing a second run using the same gear. It wasn't part of the deal but the test failure was his fault, so I'm pretty sure we will get a second run. I regret not being able to do the test myself.

The rest of the yields will be in over the next 4-5 days but the info here and the 3500/80 result is probably going to be the only relevant info from the test. The tester is indicating that the 3000/90 is very likely the best of the bunch. These two samples are relevant and directly comparable because they were the tallest plants and had no interference from other plants. The 3500K 80CRI will also be valid because it was beside the 3000/70 sample and wasn't being shaded. The 3000/70 sample was being shaded by the 2700/90, and the 3000/80 was shaded by both the 2700/90 and 3000/90 so I suspect the 3000/80 will do the worst, but the results aren't going to speak to the efficacy of those two spectrums. What we're really getting is 3000/90 vs 3500/80 vs 2700/90. Hopefully in about 3 months we'll have relevant results for all 5 spectrums.
 
I'm glad you guys are doing a second run because I personally think 4000k 80CRI should be included because of the amount of green added to the spectrum.

Still, hope you guys know you're doing God's work over there.
 
Rahz said:
The yield results for 3000/90 and 2700/90 are in.

3000/90 - 367 grams.
2700/90 - 344 grams.

I've not been getting pictures since I told him I was sure the test needed to be redone, and I haven't pushed it because he wasn't real happy about doing a second run using the same gear. It wasn't part of the deal but the test failure was his fault, so I'm pretty sure we will get a second run. I regret not being able to do the test myself.

The rest of the yields will be in over the next 4-5 days but the info here and the 3500/80 result is probably going to be the only relevant info from the test. The tester is indicating that the 3000/90 is very likely the best of the bunch. These two samples are relevant and directly comparable because they were the tallest plants and had no interference from other plants. The 3500K 80CRI will also be valid because it was beside the 3000/70 sample and wasn't being shaded. The 3000/70 sample was being shaded by the 2700/90, and the 3000/80 was shaded by both the 2700/90 and 3000/90 so I suspect the 3000/80 will do the worst, but the results aren't going to speak to the efficacy of those two spectrums. What we're really getting is 3000/90 vs 3500/80 vs 2700/90. Hopefully in about 3 months we'll have relevant results for all 5 spectrums.
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3000K/90CRI has been mentioned in several circles as being pretty stellar, these results would seem to corroborate with those.
 
I wish I had added 4K but I didn't want to leave any of the ones I did choose out of the test and 5 samples was pushing it. I'll give it some thought. It would be cheaper now since I can just ship the cobs and have them switched on the 3500/80 or 2700/90 lamps.
 
Rahz said:
The yield results for 3000/90 and 2700/90 are in.

3000/90 - 367 grams.
2700/90 - 344 grams.

I've not been getting pictures since I told him I was sure the test needed to be redone, and I haven't pushed it because he wasn't real happy about doing a second run using the same gear. It wasn't part of the deal but the test failure was his fault, so I'm pretty sure we will get a second run. I regret not being able to do the test myself.

The rest of the yields will be in over the next 4-5 days but the info here and the 3500/80 result is probably going to be the only relevant info from the test. The tester is indicating that the 3000/90 is very likely the best of the bunch. These two samples are relevant and directly comparable because they were the tallest plants and had no interference from other plants. The 3500K 80CRI will also be valid because it was beside the 3000/70 sample and wasn't being shaded. The 3000/70 sample was being shaded by the 2700/90, and the 3000/80 was shaded by both the 2700/90 and 3000/90 so I suspect the 3000/80 will do the worst, but the results aren't going to speak to the efficacy of those two spectrums. What we're really getting is 3000/90 vs 3500/80 vs 2700/90. Hopefully in about 3 months we'll have relevant results for all 5 spectrums.
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I know all the numbers are not in for comparison, but the boxes look to be about 24" square, or about 4 square feet. 367 grams out of 4 square feet is a killer yield! If I am way off on the box size please let me know.
 
BuddyColas said:
I know all the numbers are not in for comparison, but the boxes look to be about 24" square, or about 4 square feet. 367 grams out of 4 square feet is a killer yield! If I am way off on the box size please let me know.
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You are correct about the size of the boxes, but keep in mind they grew up out of the box and were leaning out so the effective area is larger. You can also see how this is going to screw the 3000/80, being between the two taller grows.

Each lamp is 200w. Taken alone it indicates 1.83 GPW from the 3000/90 sample, but it was leaching light from the box beside it. I think the final GPW for the whole grow will be more realistic, but also will end up being pretty nice. If the veg time hadn't been extended to the point the plants grew up out of the box we would have real GPW figures for each one.

Now that I think about it, the 3500K result might not be fair since it wasn't able to bush out as much as the high CRI samples, so all we're really learning is that 3000/90 is better than 2700/90. For that matter, the 3000/90 had a couple inches on the 2700/90... so even that may not be a totally fair comparison. I pointed out the flaw in the test as soon as it became apparent, so I hope nobody has been holding their breath. We'll just have to do it again.
 
Rahz, first let me say I'm impressed with your initiative and your results. I mean, 1.8g/w in less then 5 sq feet , considering that they grew out of the box, is amazing. What did fed to them ?

Next time you may try adding some plywood on the sides of your boxes :)

Since you are gonna make a new experiment, why not add a control subject ? May I suggest 3590 3.500k ? I have a feeling that you may have some of those laying around.
 
GPW is not everything. What about the quality? The smell, the taste, the resin, the flowering time? Is there anything else you noticed when you compare CRI80 to CRI90? (I mean the person who did this comparison)

Thanks for doing this btw! :wink: :joint:
 
The enthusiasm for this series of tests is amazing!

I'm interested in seeing the continuum of changes in response to different color temperatures and CRI ratings.
 
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