CobKits
Well-Known Member
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
CRI test and Mcree weighted results
- Thread starter Rahz
- Start date
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
DrBlaze
Well-Known Member
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 :/
mauricem00
Well-Known Member
these theoretical discussions are entertaining but the only way to determine how a plant will perform under a light is to actually grow a plant under that light. doing a well controlled side by side comparison grow is the only way to determine the difference between lights
Warpedpassage
Well-Known Member
I remember you also using 660nm deep red. Have you decided if its worth running additional 660nm with the cobs?
captainmorgan
Well-Known Member
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.
Still experimenting but with my COB panels being set up to maximize efficiency, adding reds actual lowers the overall efficiency.
wietefras
Well-Known Member
Depends on what current you run them on.
captainmorgan
Well-Known Member
That's part of LED tech, balancing price vs performance vs operating cost, looking forward to playing with the new gen of reds with COB's and QB's.
wietefras
Well-Known Member
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.
Rahz
Well-Known Member
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.
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.
ttystikk
Well-Known Member
3000K/90CRI has been mentioned in several circles as being pretty stellar, these results would seem to corroborate with those.
BuddyColas
Well-Known Member
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.
Rahz
Well-Known Member
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.
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.
HighOnDIYLife
Active Member
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!
Thanks for doing this btw!
MeGaKiLlErMaN
Well-Known Member
For the 4000k we will see soon enough, not this same test, but it will be telling at least for the g/w aspect
Rocket Soul
Well-Known Member
Most valuable thread at the moment