DiY LEDs - How to Power Them

[wietefras]

@salmonetin, An Arduino datalogger isn't much special. Just a board with some sensors connected. I hooked it up to to a webserver to produce the graphs.

Maybe not entirely on topic and all, but it's related to dimming the led drivers right?

Indeed I used the Melexis IR thermometer. You can see it peeking through the middle of this dummy security cam housing:


and this is the "prototype" connection on the inside:


It's an I2C device so it hooks right up to an Arduino.

The VPD is based on the PT (plant temperature), AT (Ambient temperature) and RH (relative humidity) and that results in the orange chart at the bottom:


My goal would be to keep that VPD line more level by dimming the light whenever it gets too high.

I currently use a 1.4A driver for the leds and I'm also considering getting something with a bit more power so I could boost it a bit higher when the VPD is low.

There is no fan controller in this tent. It's on a variac at a set speed. So you can see the temperature rise at the end of the day when the plants evaporate less. They were in a DWC bucket which is kept filled to the same level.

I tried hooking up a water sensor to see how much water needed to be added over time to see what the plants were actually drinking, but by the time I was ready to test that the plants were done and harvested

 

[guod]

plant(leaf) temperature lower then Ambient temperature? can happend but normally the leaf temp is higher,

http://plantsinaction.science.uq.edu.au/edition1/?q=content/14-1-2-plant-temperatures

 

[salmonetin]

...@wietefras thanks....but any pics of your set up? ...your arduino datalogger sistem...parts.. conections.... seems to me lot of sensors... its just for my curiosity....

...and thanks again Guod ......



Saludos

 

[wietefras]

@guod, Leaves should constantly being cooled by the plant's evaporation and therefore they should always be colder than the ambient temperature. If not then they are basically burning up. Which indeed will happen when the plants are in the full sun on a 32C day.

I got the IR temp sensor to prevent that from happening. When you overheat the plant the stomata will close and photosynthesis stops. That's when you are wasting energy. Although that was an issue I had under HPS. With these Cree COB's that's not so much an issue because they don't radiate so much heat on the canopy like HPS does.

That's also where this comes from. Dimlux sells controllers that control their HPS fxture dimming based on VPD. Gavita does HPS dimming basid on ambient temperature with their Master Controller.

Still I'd think that the VPD fluctuation does indicate the plant has a day rythm where they might be able to use more light in the middle (or slightly before the mdidle) of the day and less at the ends. Which is what would occur in nature too with the sun being the hottest in the middle of the day.

@salmonetin, Maybe I should start a separate Arduino thread. I have a lot of Arduino gizmo's: the datalogger (with temp, RH and lux sensor), a hydro reservoir top off, IR heat image camera, IR plant temp sensor, digital tensiometers, a 0-10V fan controller. I hooked up scales to the Arduino to weigh the plants while growing (didn't work though).

 

[Castaman]

Hello again. I'll plan to use 2 x ELG-150-C1050B for 3 x 2 CXA 3070, there is a voltage surplus, as ELG have 143v and 3 cobs will drain 37*3=111, so i have 143-111=32v rest.
Can i use this voltage for a n*660nm XPEPHR for example, they have 1000mA max according to datasheet so they have to work well this can help reach driver max efficiency and decrease drivers quantity. Will it work?

 

[salmonetin]

@salmonetin, Maybe I should start a separate Arduino thread. I have a lot of Arduino gizmo's: the datalogger (with temp, RH and lux sensor), a hydro reservoir top off, IR heat image camera, IR plant temp sensor, digital tensiometers, a 0-10V fan controller. I hooked up scales to the Arduino to weigh the plants while growing (didn't work though).

...start the thread... im curious about your setup...lol... i told you on my previous post...



Saludos

 

[ReddEyez]

Hello everybody, hope all is well today. First i would like to say thank you to everyone who contributes to the DIY thread. If it wasnt for everyone at RIU i would be purchasing more cheap blurple lights on the 1st instead of Cree. Ok guys i need some help please. I thought i had my drivers picked out. I have been reading the diy led forums and i was planning on using 2 meanwell hlg 185 @ 1400ma for 8 cxb3070 Cree chips for a 4x2 (dimmable), until i was able to find this for 30 bucks http://datasheet.octopart.com/LEDINTA0700C210DN-Philips-datasheet-12556749.pdf
(the heat sink and leds was worth more than that)
LED-INTA-0700C-210-DN
Philips advance Xitanium 150w 0.70a
0-10v analog dimming
Vin: 120/277Vrms
Freq: 50/60 HZ
Iin: 1.4/0.60
Iout: 0.70Adc
Vout: 60-210Vdc
(Absolute max Vout: 250 Vdc; Iout:0.76Adc)
I realize this would be about half as much power to the chips themselves, but that is about all i know. Ive been comparing numbers but now i am lost. I want to cover a 4x2 with Cree cxb3070s. I realize i need another driver to get my PPFD to where it needs to be, but i have to utilize this driver due to my budget. Still have to purchase another driver and my COBS so i am definitely up for any suggestions. Any help you could give me would be greatly appreciated. Thank you so much! Edit: I watched Growmou5 youtube video for the 10th time,lol. If my math is right i can run 6 cxb3070s@700ma in series? I i have very limited experience with these drivers and COBs. If this driver will not help fulfill my needs, then i have no problem selling it and getting a meanwell, but I would prefer not too. Thanks again. Pleas help.

 

[nogod_]

First off, it's not half as much, it's 3/4 the wattage. 150w instead of 200w.

If you want to stay at the same power per chip you're going to have to buy cxb3590s because that driver puts out 700mA not 1400mA.

You'd still probably be fine for your space with:

6 x 72v cxb3590 (300w,~150parw)
2 x heatsink
2 x xitanium

Be a little over $500 for those items to your door. Not bad if you're looking for a solid, inexpensive option.

Hello everybody, hope all is well today. First i would like to say thank you to everyone who contributes to the DIY thread. If it wasnt for everyone at RIU i would be purchasing more cheap blurple lights on the 1st instead of Cree. Ok guys i need some help please. I thought i had my drivers picked out. I have been reading the diy led forums and i was planning on using 2 meanwell hlg 185 @ 1400ma for 8 cxb3070 Cree chips for a 4x2 (dimmable), until i was able to find this for 30 bucks http://datasheet.octopart.com/LEDINTA0700C210DN-Philips-datasheet-12556749.pdf
(the heat sink and leds was worth more than that)
LED-INTA-0700C-210-DN
Philips advance Xitanium 150w 0.70a
0-10v analog dimming
Vin: 120/277Vrms
Freq: 50/60 HZ
Iin: 1.4/0.60
Iout: 0.70Adc
Vout: 60-210Vdc
(Absolute max Vout: 250 Vdc; Iout:0.76Adc)
I realize this would be about half as much power to the chips themselves, but that is about all i know. Ive been comparing numbers but now i am lost. I want to cover a 4x2 with Cree cxb3070s. I realize i need another driver to get my PPFD to where it needs to be, but i have to utilize this driver due to my budget. Still have to purchase another driver and my COBS so i am definitely up for any suggestions. Any help you could give me would be greatly appreciated. Thank you so much! Edit: I watched Growmou5 youtube video for the 10th time,lol. If my math is right i can run 6 cxb3070s@700ma in series? I i have very limited experience with these drivers and COBs. If this driver will not help fulfill my needs, then i have no problem selling it and getting a meanwell, but I would prefer not too. Thanks again. Pleas help.

 

[Castaman]

Is my scheme is ok?

 

[ReddEyez]

First off, it's not half as much, it's 3/4 the wattage. 150w instead of 200w.

If you want to stay at the same power per chip you're going to have to buy cxb3590s because that driver puts out 700mA not 1400mA.

You'd still probably be fine for your space with:

6 x 72v cxb3590 (300w,~150parw)
2 x heatsink
2 x xitanium

Be a little over $500 for those items to your door. Not bad if you're looking for a solid, inexpensive option.[/QU
Thank you very much for your input nogod. I have been reading TOO long, lol. Ive only changed my mind 1000 times. Would a hlg-c700b@72v running the other 3 be the same as adding another Xitanium driver? I still have to purchase one more driver. One more question guys. Is it possible to run the cxb3070s@700ma 72v like the cxb3590s? And if so can i run the above setup with the cxb3070s? I dont see 72v for the 3070s on the matching drivers to cob chart. I realize i wold lose efficiency, but the price difference is significant.(for me anyway) Thank you all for sharing your knowledge. Hope your day is a good one!

 

[wietefras]

...start the thread... im curious about your setup...lol... i told you on my previous post...



Saludos

Started a thread: http://rollitup.org/t/arduino-experiments-datalogger-for-the-grow-room.893752/

 

[nogod_]

Nope, only 3590 comes in 72v. Just buy another xitanium there are tons for $30 on fleabay.

If you really want to save dough try to find some cxA3590

 

[ReddEyez]

Will do nogod, thanks for the tip man. I have not read much on the cxas. I have been looking at the 3070s and cxb3590s. I will check them out. I have not been able to find the cxbs in 3500k anyway. Unless i buy 50 of them. Thanks again.

 

[PurpleBuz]

Will do nogod, thanks for the tip man. I have not read much on the cxas. I have been looking at the 3070s and cxb3590s. I will check them out. I have not been able to find the cxbs in 3500k anyway. Unless i buy 50 of them. Thanks again.

check out cxb3070 3500k BB bin at pacificlightconcepts.com

 

[ReddEyez]

check out cxb3070 3500k BB bin at pacificlightconcepts.com

Right on PurpleBuz. I emailed him couple days and he had 30 somethin of them left, but he was getting more after the first of the year. Will definitely go with him if i get the cxb3070s. Im waiting on the 1st myself. Thats a kick ass light he has for sale on his site too. Thanks for the heads up man, take care.

 

[Greenbyme]

Hi chaps! I have a question for you. I followed your advices and I built my system. It's 10 CXB3590 drive by 5 HLG-185H-1400A. Each driver power 2 CXB in series. Now I wanted to dim one before to plug all drivers. Then I connected my multimeter in series and I manage it with "lo adj" crew available on it. But I can only have 0.85A at the maximum (display on my multimeter which is connected to 10A connector and slot to 10A). I tested another HLG driver and same result. Have you a explanation for that?! Maybe there is another possibility to dim them? Thanks in advance for your help. Cheers

 

[alesh]

Hi chaps! I have a question for you. I followed your advices and I built my system. It's 10 CXB3590 drive by 5 HLG-185H-1400A. Each driver power 2 CXB in series. Now I wanted to dim one before to plug all drivers. Then I connected my multimeter in series and I manage it with "lo adj" crew available on it. But I can only have 0.85A at the maximum (display on my multimeter which is connected to 10A connector and slot to 10A). I tested another HLG driver and same result. Have you a explanation for that?! Maybe there is another possibility to dim them? Thanks in advance for your help. Cheers

I'll assume that you have the 72V version of 3590. The driver has a voltage cap at around 143V and two of your COBs happen to be 143V at around 850mA.

 

[alesh]

Hi chaps! I have a question for you. I followed your advices and I built my system. It's 10 CXB3590 drive by 5 HLG-185H-1400A. Each driver power 2 CXB in series. Now I wanted to dim one before to plug all drivers. Then I connected my multimeter in series and I manage it with "lo adj" crew available on it. But I can only have 0.85A at the maximum (display on my multimeter which is connected to 10A connector and slot to 10A). I tested another HLG driver and same result. Have you a explanation for that?! Maybe there is another possibility to dim them? Thanks in advance for your help. Cheers

I assume that you got the 72V version of 3590. The driver has a voltage cap at around 143V and that also happens to be Vf of the COB series at around 950mA. Your MM also adds a slight voltage drop.

 

[Greenbyme]

First thanks for your responses. Yes I have a cxb3590 72v. So if I understand I am at the maximum voltage for the driver and limited to 850mA. I wanted to run at 1050/1100mA. Now I have no choice to use these drivers. Can I power only one CXB3590 72v at 1100mA with this driver? And have you a suggestion for drive the 5 others CXB? Many thanks in advance

 

[Greenbyme]

First thanks for your responses. Yes I have a cxb3590 72v. So if I understand I am at the maximum voltage for the driver and limited to 850mA. I wanted to run at 1050/1100mA. Now I have no choice to use these drivers. Can I power only one CXB3590 72v at 1100mA with this driver? And have you a suggestion for drive the 5 others CXB? Many thanks in advance

 

[Sad_plant]

Hi,

Is there a reason no one is mentioning the cheap LPC-60-1400 driver for the CXB3590 ?
I run 2 x CXA3070 on a LPC-60-1400 each currently which works perfectly, but no one ever mentions them.
Neither are they visible in this sheet: https://docs.google.com/spreadsheets/d/1nKfc12OCuDu7puJCa_6maefyCVm3gS5sBmzAXOlh06w/edit#gid=1157681753 regarding matching drivers.

 

[Greenbyme]

First thanks for your responses. Yes I have a cxb3590 72v. So if I understand I am at the maximum voltage for the driver and limited to 850mA. I wanted to run at 1050/1100mA. Now I have no choice to use these drivers. Can I power only one CXB3590 72v at 1100mA with this driver? And have you a suggestion for drive the 5 others CXB? Many thanks in advance

Sorry It seems I have some difficulties to post my response from my mobile phone.

 

[alesh]

First thanks for your responses. Yes I have a cxb3590 72v. So if I understand I am at the maximum voltage for the driver and limited to 850mA. I wanted to run at 1050/1100mA. Now I have no choice to use these drivers. Can I power only one CXB3590 72v at 1100mA with this driver? And have you a suggestion for drive the 5 others CXB? Many thanks in advance

You can drive single 3590 up to 1400mA with the driver or 2 3590s at around 950-1000mA. When you connect your MM, current drops to about 850mA you're reading.

 

[alesh]

Hi,

Is there a reason no one is mentioning the cheap LPC-60-1400 driver for the CXB3590 ?
I run 2 x CXA3070 on a LPC-60-1400 each currently which works perfectly, but no one ever mentions them.
Neither are they visible in this sheet: https://docs.google.com/spreadsheets/d/1nKfc12OCuDu7puJCa_6maefyCVm3gS5sBmzAXOlh06w/edit#gid=1157681753 regarding matching drivers.

LPC-60-1400 is not very efficient, it can't be dimmed and in fact isn't that cheap.