QBX 80/90 cri grow

NapalmD

Well-Known Member
Started some random seeds for this run under the QBX from Horticulture Lighting Group. It's an 80/90 cri mix in 3000k.
C99 and Kandy Kush in back. Og13 and Green crack up front. The 2 little ones on the left are bagseed from an old Underdog run I think. This is just a quick run to see how the cri combo performs. 4 plants were vegged 2.5 weeks and 2 on left a week.

Flower day 5
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GrowLightResearch

Well-Known Member
I think you will be pleased with the results.
I could find no information on an HLG QBX board
I assume they are using the LM561B Plus for the 90 CRI.

This is why I thnk you will be pleased.
While the LM561B CRI 90 is only 25 lm, 130 lm/W, where the LM561C is 37 lm, 170 lm/W, it should do a better job flowering.

Red is the best wavelength for photosynthesis.
An LM561 in general will put out the same number of photons.
A 90 CRI will significantly lower the lm/W.
It will not have a significant effect on the PPFD.
A 3000K CRI 90 will peak at about 625nm (red).
A red photon contributes significantly less to lumens.

In the SPD you can see the peak is shifted left from the typical yellow to red.
Less green and yellow, more red.

the biggest mistake growers make when selecting an LED is to rely too heavily on the lumens rather than spectrum.

Why 170 lm/W looks so much better then 130 lm/W, that may not be the case.
In a particular LED series the same deep blue LED is used for all CCT and CRI.
the difference is the phosphor covering the LED.
The phosphor is a wavelength converter.
It does take more energy to convert blue to red than blue to green. So there is some loss.
But by far the biggest factor is the lumen to PPFD conversion.

If you convert a green photon to lux it gets multiplied by 147.
If you convert a red photon to lux it get multiplied only by 7.5.
And then the in between wavelengths are somewhere in between.

The point being a lower lm/w does not mean less photons. Not proportionately less in the same LED series.

convertRYG.JPG
Source: http://www.growlightresearch.com/ppfd/convert.html

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nc208

Well-Known Member
Started some random seeds for this run under the QBX from Horticulture Lighting Group. It's an 80/90 cri mix in 3000k.
C99 and Kandy Kush in back. Og13 and Green crack up front. The 2 little ones on the left are bagseed from an old Underdog run I think. This is just a quick run to see how the cri combo performs. 4 plants were vegged 2.5 weeks and 2 on left a week.

Flower day 5
View attachment 4084342
Looks great so far, is the qbx a new board from hlg?
 

NapalmD

Well-Known Member
Flower day 28
Tossed the 2 bag seed plants last week. They were just stuck on stupid and not wanting to flower. These plants were untouched except for supercropping the tops on the back two. Just a test to see how the plants respond to the light.
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NapalmD

Well-Known Member
Flower day 35
That C99 is a quick finisher. She looks 20-25 days to go and you don't want to over cook her because she'll swell up so thick it'll be hard to keep bud rot away even with low rh. I make sure she gets the most breeze off the fans too. Green Cracks not far behind in the finishing dept and also has a nice tropical funk similar to the Cindy but totally different if that makes any sense. The others will just finish and go dark with the rest since the C99 and GC are the favorites here in this little test run. This KK pheno is looking to be like the last one. Airy and low yielding but good smoke nonetheless.
The og13 is just meh.
I could see both qualities of the 80/90cri combo so far in the plants.
This is the furthest away I've ever kept any LED light away from the plants too.
Can't wait to do another sog filled with MAC's under this light. That's next.

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NapalmD

Well-Known Member
Took down the C99 last week. The green crack 5 days ago and just moved the Kandy Kush and OG13 to my dark tent to dry. I don't like staggered harvesting like that. All in all the OG13 kicked ass. Fat juicy top cola reeking of straight og. The Kandy and Green Crack did ok as did the C99. Will post some pics when they go in jars.
 
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