CXB3590 1500W

[littlejacob]

Bonjour
Ok now i see the big picture...
We call it in France V-scrog...for it is more U-scrog...but you know what I mean!
2x600 in a 4x4 it is twice what I used to have, before cob.Heat must be a real problem in your growbox!?
Switch to cob is going to be a real plus for you...less heat, more spread and better efficiency...so always keep your phone on you and some food supplies for the day you decide to grow a 20weeks landrace sativa...if you fall in your box there is little chances anyone's finding you in the jungle
Have a great day ★

 

[zep_lover]

Bonjour
Ok now i see the big picture...
We call it in France V-scrog...for it is more U-scrog...but you know what I mean!
2x600 in a 4x4 it is twice what I used to have, before cob.Heat must be a real problem in your growbox!?
Switch to cob is going to be a real plus for you...less heat, more spread and better efficiency...so always keep your phone on you and some food supplies for the day you decide to grow a 20weeks landrace sativa...if you fall in your box there is little chances anyone's finding you in the jungle
Have a great day ★

my temps usually dont go over 83 in the summer .the bare bulbs with a slow fan underneath blowing up to the carbon filter and fan works great.
summer time i usually run top bulb at 600 and bottom at 450.in a bad heat wave i might have to run both at 450.

 

[ttystikk]

my temps usually dont go over 83 in the summer .the bare bulbs with a slow fan underneath blowing up to the carbon filter and fan works great.
summer time i usually run top bulb at 600 and bottom at 450.in a bad heat wave i might have to run both at 450.

Try not to run HID lights (HPS or MH) at anything other than their rated output. Running them below their rating wears them faster, they don't emit the proportional amount of light (ie running at 60% gives only 45% of light) and they don't emit the proper color spectrum.

 

[littlejacob]

Bonjour
So it must be the same with cob when dimmed...?!?
If you dim up or down the spectum is going to be altered...is it?!?
And if it is different than dim hps/mh, why and how?
Have a great day ★

 

[ttystikk]

Bonjour
So it must be the same with cob when dimmed...?!?
If you dim up or down the spectum is going to be altered...is it?!?
And if it is different than dim hps/mh, why and how?
Have a great day ★

No, COB tech does not change its spectrum output when dimmed, in fact it gets slightly more efficient.

My words of caution apply to HPS, MH, CDM and CMH type lamps.

 

[littlejacob]

Bonjour
I knew about efficiency...but to the eye when you dim down it look hot and when up it look cold...maybe I have too old eyes...?!!
Why it occurs on other light and not on leds? And I talk about spectrum/wavelenght not efficiency.
CU

 

[EfficientWatt]

Don't quote me on this, but I'm pretty sure it does occur with leds (monos at least), where the dominant wavelength moves a little bit depending on how hard you run them.

But the spectral shift is so minimal, we can basically ignore it.
Nothing like HID's where it is noticeable to the naked eye, and accompanied with serious efficiecy drop ..

Bonjour
I knew about efficiency...but to the eye when you dim down it look hot and when up it look cold...maybe I have too old eyes...?!!
Why it occurs on other light and not on leds? And I talk about spectrum/wavelenght not efficiency.
CU

 

[DonPetro]

Killing @SupraSPL and good to see someone running some beanho strains. That d/kgxgb looks amazing! I've been wanting something with those blaze orange almost red hairs and that looks like the ticket. Have you run any of his other gear?

 

[alesh]

Don't quote me on this, but I'm pretty sure it does occur with leds (monos at least), where the dominant wavelength moves a little bit depending on how hard you run them.

But the spectral shift is so minimal, we can basically ignore it.
Nothing like HID's where it is noticeable to the naked eye, and accompanied with serious efficiecy drop ..

True.
Notice that there are usually charts with chromaticity coordinates change over current and/or temperature in the data sheets of white LEDs. Different coordinates = different hue/color = different SPD. But as you said, the changes are too small to be a concern for us (but you can see it by the naked eye too, especially when you have something for comparison).

@littlejacob LED and HID are completely different technologies. It might not be good to draw conclusions about one from the other.

 

[ananaz]

Hello guys,

I'm quite new to this forum, so im sorry if im hijacking this thread for my question.

I wanted to order from alibaba via kingbrite optoelectronics a couple of days ago.
Two days later still no answer on my order on alibaba, i messaged jerry. He told me 'to give my him paypal account so he can send me a request'.
Im not sure what he mean, with that sentence.

How did your order procedure go?

Best regards

(I'm not native english, excuse me for that tho)

 

[SupraSPL]

He can send an invoice to your paypal account to make it easier to pay and then you have a record of the transaction and the agreed products/pricing. If you don't like what you see on the invoice you can choose not to make the order.

 

[ananaz]

You are clearing it up for me, thanks.

I guess he needs my paypal account name then?

 

[SupraSPL]

Yes he would need your paypal email address

 

[littlejacob]

True.
Notice that there are usually charts with chromaticity coordinates change over current and/or temperature in the data sheets of white LEDs. Different coordinates = different hue/color = different SPD. But as you said, the changes are too small to be a concern for us (but you can see it by the naked eye too, especially when you have something for comparison).

@littlejacob LED and HID are completely different technologies. It might not be good to draw conclusions about one from the other.

Bonjour
Ok, I agree with you...
Is anyone know how low I have to drive my cxb 3590 to be able to see the dies? To check if all diodes work at same intensity!?
Have a great day ★

 

[Iceveign]

@45.7%
(2) CXB3590 3500K CD 36V @ 2.5A (91.65W ea) $95
(2) HLN-80H-36A $90
183 dissipation W -> 99.37W heat
(2) Arctic 64 Plus CPU coolers $26
(2) lenses $8
83.63 PAR W covering 5 ft² = 749 PPFD
$219 = 2.62/PAR W

.

Hey Supra, can this be run passively? I have 2 cobs left(the ones listed above) and a 5.88" x 19" heatsink. is there another driver you might recommend if this one would be too hot for my heatsink? thank you

 

[SupraSPL]

That heatsink is good for about 41W of heat passive cooled or 125W active cooled. So you could run that setup but you would need a 140mm fan for active cooling and you might need a lot vertical height because that is a lot of PAR W in a concentrated lamp.

If you want to run them softer to use that heatsink passively, they would need to be at about 1.4A. You could use a pair of these:
http://www.ebay.com/itm/50w-Waterproof-LED-Power-Supply-Driver-F-50Watt-High-power-LED-Chip-Bulb-85-265V-/221661755959?hash=item339c11fa37

 

[alesh]

That heatsink is good for about 41W of heat passive cooled or 125W active cooled. So you could run that setup but you would need a 140mm fan for active cooling and you might need a lot vertical height because that is a lot of PAR W in a concentrated lamp.

If you want to run them softer to use that heatsink passively, they would need to be at about 1.4A. You could use a pair of these:
http://www.ebay.com/itm/50w-Waterproof-LED-Power-Supply-Driver-F-50Watt-High-power-LED-Chip-Bulb-85-265V-/221661755959?hash=item339c11fa37

What are the values you currently recommend for both active and passive cooling?

 

[SupraSPL]

There are so many variables such as base thickness, fan speed/CFM, fin height, drive current, COB thermal impedance etc. If I had more time I would like to do a lot more testing (in situ), but these are safe figures for a starting point: 40cm²/W of heat for active cooling with any profile or 120cm²/W of heat for passive cooling with passive cooling friendly profiles (2.08" 3.5" 4.23" 4.9" 5.88" 7.28" 8.46" 10")

Here are some of the test results using the figures recommended above:

CXB3590 @ 25W, passive cooled on 4.9" = 1.5%~2% temp droop (large room but no air circulation during test)
CXA3590 @ 80W, active cooled on 3.5" = 3.5% temp droop
CXB3590 @ 100W, CPU cooler w 5V fan = ~2.5% temp droop


This was a less than perfect test but useful data, a 8.46" X 12" piece of heatsink (4794 cm²) with a pair of CXA3070 3K AB. Again large room but no air movement in the room only convection, so results in situ would be much better due to circulation fans and ventilation fans.
@ 900mA 62.5W (31.25W heat) = 153cm²/W - 3.3% droop
@ 1050mA 70.6W (36.36W heat) = 132cm²/W - 4.4% droop
@ 1400mA 102.4W (55.8W heat) = 86cm²/W - 6.45% droop


Since many DIYers run at 50W/COB I would like to document some experiments with that setup and vary the heatsink surface area to see how if affects the temp droop in situ. Actually I have done the experiments and they were a success at the recommended figures but the data didnt make it into my spreadsheet yet and I would like to repeat them anyway.

 

[ttystikk]

Bonjour
Maybe 16 cxb 3590 3500k 36v cd @1050mA in the 4x4 would be great
4x4 for a 4x4...great spread and efficiency
And less driver
And tall plant (more than 3ft) is a waste of time imo.
Have a great day ★

How is this considered wasteful in your world?

 

[Iceveign]

Thanks Supra, I don't know what we would do without you.

I do want to run the cobs softer, was wanting to stick with meanwell, but if you feel those drivers are dependable, I'm not opposed to trying them. The only thing that is beginning to bother me about my diy setup are all the dang wires hanging around. So the less components I can use the less clutter hanging around.