DHP Presents Citizen Cob 1812 3500k 80CRI Vs 1812 3500k 90 CRI

oops missed that thanks!!

tomate said:

@The Dawg
Are you running 12/12 or a different light schedule?

The 90 CRI plant was harvested on day 56 of flower?

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No I Don't Run The Conventional 18/6 12/12 Light Schedule Rather I Start At 24/0 And Lower It Weekly Buy 2 Hours. When I Hit 14/10 I Leave It their Till My Ladies Start Showing Pistils Then I Lower From 14/10 To 13/11 For 3 Weeks Then To 12/12 For The Finish

The Dawg said:

No I Don't Run The Conventional 18/6 12/12 Light Schedule Rather I Start At 24/0 And Lower It Weekly Buy 2 Hours. When I Hit 14/10 I Leave It their Till My Ladies Start Showing Pistils Then I Lower From 14/10 To 13/11 For 3 Weeks Then To 12/12 For The Finish

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Very interesting!! Sorry to drag your thread off topic, but do you think this could be beneficial in terms of trying to force the plants to show their sex a little earlier than normal? I've started a grow using bagseed and in my country we are technically only allowed one plant. So I'm trying to identify the ladies as early as possible, without stressing them too much, so I can put a girl into my bubleponic setup and get back to being "legal" asap.

DonnyDee said:

Very interesting!! Sorry to drag your thread off topic, but do you think this could be beneficial in terms of trying to force the plants to show their sex a little earlier than normal? I've started a grow using bagseed and in my country we are technically only allowed one plant. So I'm trying to identify the ladies as early as possible, without stressing them too much, so I can put a girl into my bubleponic setup and get back to being "legal" asap.

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First Of All Where My Manors Welcome Brother DonnyDee

My Ladies Usually Show Sex Between Week 2-3 In Veg

Legal Fuck Legal. Peace And Take A Trip And Never Leave The Farm

The Dawg said:

First Of All Where My Manors Welcome Brother DonnyDee

My Ladies Usually Show Sex Between Week 2-3 In Veg

Legal Fuck Legal. Peace And Take A Trip And Never Leave The Farm

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I've been following this thread for so long, I already feel part of the club. Thanks so much man and thank you for sharing your findings so freely.

Oh wow, I'll be copying your timing schedule from now on, it clearly gets results

DonnyDee said:

As you can see here, the 4k 80cri cob has a relatively even response in terms of reds and blues. I am hoping that this shift will simulate summer morning light. The 20% cutoff on this is 690nm, with 660nm ("photo red") having an intensity of only 45%. Blues peak at 91% over 450nm. If you look at the area under the curve, the 4k 80cri has the "most" output of the bunch, which equates to it having the best efficiency (ignoring ppfd etc)

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The curves in the graph are not relative to each other so comparing area under any of them is completely useless.

alesh said:

The curves in the graph are not relative to each other so comparing area under any of them is completely useless.

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Yea, that's why you consider lm/W as well instead of isolating them, which would be useless.

Also, perhaps you don't understand what the graphs are or what I was trying to explain. If comparing their output on that graph was useless, it would have never been published.

alesh said:

The curves in the graph are not relative to each other so comparing area under any of them is completely useless.

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All curves in the graph are given for TJ 85ºC, at 1620mA, so I guess you can compare them objectively.

Edit: But I will admit my first thought as the same. Then I noticed this "TJ 85ºC, at 1620mA" on top right of each graph.

PSUAGRO. said:

Lol...... I said the exact same thing in my food vero thread=like growing on mars

Got a link ? Wonder if he started it before mine or after?

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I started using the 1750k the last three weeks of my last Grow in March. Noticed the buds gained density. I started a new Grow (10 of Bergman's strawberry Kush in a 2x4 tent) using the 1750k as a sunrise/sunset simulator. 20 minutes on before the 4000k and 20 minutes after lights out. Just flipped to 12-12 May 1. The 1750k's are running the full 12-12 with the 4000k for flower.
7 weeks left till harvest.
Results so far seem to show earlier wake-up/faster sleep. Buds started showing day 5 of 12-12.

JimmyJames905 said:

I started using the 1750k the last three weeks of my last Grow in March. Noticed the buds gained density. I started a new Grow (10 of Bergman's strawberry Kush in a 2x4 tent) using the 1750k as a sunrise/sunset simulator. 20 minutes on before the 4000k and 20 minutes after lights out. Just flipped to 12-12 May 1. The 1750k's are running the full 12-12 with the 4000k for flower.
7 weeks left till harvest.
Results so far seem to show earlier wake-up/faster sleep. Buds started showing day 5 of 12-12.

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Interesting, more inputs about this red chip the better.

I'm running it straight 1750k and 730nm trigger. It's pfr over kill.

Stretch has been manageable surprisingly, kush cross, but still.......i think @Malocan also noticed this.

Maybe coming full circle and doing 50/50 4000k/1750k is what's next

I still wonder if your hydrofarm " par" meter is accurate over 640nm ? I've seen the vs licor vids, all within a lux meter response though

Keep us updated grower

PSUAGRO. said:

Interesting, more inputs about this red chip the better.

I'm running it straight 1750k and 730nm trigger. It's pfr over kill.

Stretch has been manageable surprisingly, kush cross, but still.......i think @Malocan also noticed this.

Maybe coming full circle and doing 50/50 4000k/1750k is what's next

I still wonder if your hydrofarm " par" meter is accurate over 640nm ? I've seen the vs licor vids, all within a lux meter response though

Keep us updated grower

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The hydrofarm is not accurate for reds. I took it to my horticultural dept at my old Univ. and the tech there said essentially "Because red is a lower energy wavelength par meters always detect this as low output". He recommended a $4000 spectral analyzer (I'll get right on that lol). I got 1200 μmoles at 8" with the Vero 18 BXRC-17e. I'm hoping to get better results when my batch of 50 Vero 29 1750k's come in on May 24. I'll make another par test vid after I switch out the Vero 18 red array for a V29 -D-SE array.
But so far I'm very happy with them. The sunrise/sunset simulation alone is worth it. Getting bud spots in 5-7 days is an added bonus.
What are your results so far? What chip are you using?

JimmyJames905 said:

The hydrofarm is not accurate for reds. I took it to my horticultural dept at my old Univ. and the tech there said essentially "Because red is a lower energy wavelength par meters always detect this as low output". He recommended a $4000 spectral analyzer (I'll get right on that lol). I got 1200 μmoles at 8" with the Vero 18 BXRC-17e. I'm hoping to get better results when my batch of 50 Vero 29 1750k's come in on May 24. I'll make another par test vid after I switch out the Vero 18 red array for a V29 -D-SE array.
But so far I'm very happy with them. The sunrise/sunset simulation alone is worth it. Getting bud spots in 5-7 days is an added bonus.
What are your results so far? What chip are you using?

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Here you go......still in early flower

https://www.rollitup.org/t/testing-timbers-b-lux-decor-vero-fixture-1750k-hello-beautiful-spd-finger-still-on-the-trigger.935965/

PSUAGRO. said:

Here you go......still in early flower

https://www.rollitup.org/t/testing-timbers-b-lux-decor-vero-fixture-1750k-hello-beautiful-spd-finger-still-on-the-trigger.935965/

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Excellent job. We have a few people on the same page. I'm sending a few off to friends in the US and Canada when the 50 pack gets here. All with par meters. All with ongoing grows. We can get some good data.
Your gonna need a hacksaw to chop those buds up after drying. Mine were like stones.

Do you find you're getting more stretch or less than HPS?

JimmyJames905 said:

The hydrofarm is not accurate for reds. I took it to my horticultural dept at my old Univ. and the tech there said essentially "Because red is a lower energy wavelength par meters always detect this as low output". He recommended a $4000 spectral analyzer (I'll get right on that lol). I got 1200 μmoles at 8" with the Vero 18 BXRC-17e. I'm hoping to get better results when my batch of 50 Vero 29 1750k's come in on May 24. I'll make another par test vid after I switch out the Vero 18 red array for a V29 -D-SE array.
But so far I'm very happy with them. The sunrise/sunset simulation alone is worth it. Getting bud spots in 5-7 days is an added bonus.
What are your results so far? What chip are you using?

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You should talk to a prof rather than a tech. PAR meters measure amounts of photons, not the energy they carry. The tech probably got it mixed up with a lumens meter which measures the light energy using a skew towards green. It could also be the unit you have, maybe it needs calibration.

The HF does measure well for reds and blues and from what I have tested will measure up to 780nm and down to 335nm. Apogee has a significant decrease after 680nm and below 400nm whereas the licor sensor will pick up to at least 1200nm. They are all +/- 5-10% of each other and for growing, we only care about the 100s for significant digits. HF is far cheaper than the other two and more than adequate for the somewhat hostile environment a grow area can present. It comes down to the bucks you want to throw at it, but keep in mind that a par meter is the tool you use for spot checking your light getting to the leaves.

Those are good numbers for the Vero 18s, I have some 3000k 97CRI ones coming in and was expecting that range for light output.

FYI, I get the same readings for PAR between the 80 and 90 CRI 3000k Vero 29 Cs at the same wattage using any of the meters. In some cases chips with higher CRI come in better but that can be attributed to the manufacturers performance deviation tolerance of +/- 7%.

Yeah that is where we are at now for light tech, trying to etch out more performance from what the manufacturer considers a rounding error. Celeron 300a come to mind for anyone?

Photon Flinger said:

You should talk to a prof rather than a tech. PAR meters measure amounts of photons, not the energy they carry. The tech probably got it mixed up with a lumens meter which measures the light energy using a skew towards green. It could also be the unit you have, maybe it needs calibration.

The HF does measure well for reds and blues and from what I have tested will measure up to 780nm and down to 335nm. Apogee has a significant decrease after 680nm and below 400nm whereas the licor sensor will pick up to at least 1200nm. They are all +/- 5-10% of each other and for growing, we only care about the 100s for significant digits. HF is far cheaper than the other two and more than adequate for the somewhat hostile environment a grow area can present. It comes down to the bucks you want to throw at it, but keep in mind that a par meter is the tool you use for spot checking your light getting to the leaves.

Those are good numbers for the Vero 18s, I have some 3000k 97CRI ones coming in and was expecting that range for light output.

FYI, I get the same readings for PAR between the 80 and 90 CRI 3000k Vero 29 Cs at the same wattage using any of the meters. In some cases chips with higher CRI come in better but that can be attributed to the manufacturers performance deviation tolerance of +/- 7%.

Yeah that is where we are at now for light tech, trying to etch out more performance from what the manufacturer considers a rounding error. Celeron 300a come to mind for anyone?

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Ya. I'm happy with the results. My 1200μmole contradicts the 89 Lm/w that Bridgelux claims. Another user on another site lost his shit when I posted the results claiming I was "skewing" them somehow. His claim is that an 80+ lumen/w chip can not produce 1200 micromoles period. Even after I made a video par testing it he still got pissy. But he's a Cree "fanboy" and nothing beats a Cree right? Lol.

JimmyJames905 said:

Ya. I'm happy with the results. My 1200μmole contradicts the 89 Lm/w that Bridgelux claims. Another user on another site lost his shit when I posted the results claiming I was "skewing" them somehow. His claim is that an 80+ lumen/w chip can not produce 1200 micromoles period. Even after I made a video par testing it he still got pissy. But he's a Cree "fanboy" and nothing beats a Cree right? Lol.

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Who cares what others think. Right is right regardless of belief.

Lumen/w is useful because it helps us determine efficiency in the use of input current. If the math using the lumen/w works out to a 60% efficiency say, people here then make a magically jump in assuming that applies to all optical output. It puts you in the ball park somewhere.

When using this method keep in mind that there are 2 important numbers, QER and LER. They will be different for each of the CRIs, with higher CRI having lower QER which makes up for the lower lumen/w rating.

Chips in the same series put out the same amount of light for growing it is only the colors and clarity that are different.

Photon Flinger said:

Who cares what others think. Right is right regardless of belief.

Lumen/w is useful because it helps us determine efficiency in the use of input current. If the math using the lumen/w works out to a 60% efficiency say, people here then make a magically jump in assuming that applies to all optical output. It puts you in the ball park somewhere.

When using this method keep in mind that there are 2 important numbers, QER and LER. They will be different for each of the CRIs, with higher CRI having lower QER which makes up for the lower lumen/w rating.

Chips in the same series put out the same amount of light for growing it is only the colors and clarity that are different.

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Oh I agree. The guy I was arguing with made all kinds of calculations and white paper estimates even crunched numbers in a COB calculator. But the one thing he didn't do was GROW WEED WITH THE CHIP!

Real world results are more important to me than "figuring it out on paper".
I'm just glad there's other people using/testing the 1750k. GM sells it as a "Bud burst" COB through Cutter. So I figured how bad can it be?
Turns out....it's pretty damn good.

you guys ever use a pur meter?