Author Topic: grow led diy  (Read 1778 times)

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Offline Irukandji

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grow led diy
« on: March 03, 2019, 01:40:10 pm »
Hi guys,

i'm new to the Led subject and i have some questions about my Project. I want to build my own diy grow lamp.
My Problem is that i'm not sure if the calculation is wrong or not. My other question is are there some alternatives instead of my choosen led's.

LED from China all in all $18 for the LED`S for 60 LED's.

Here is the link of the LED's :  https://de.aliexpress.com/item/10-st-ck-UMAKED-High-Power-1-Watt-3-Watt-LED-Chips-Lampe-Licht-SMD-Warm/32847256118.html?spm=a2g0x.search0104.3.43.48e34ec4bEGrJX&transAbTest=ae803_3&ws_ab_test=searchweb0_0%2Csearchweb201602_9_10065_10068_10547_319_317_10548_10696_10084_453_10083_454_10618_10304_10307_10820_10821_537_10302_536_10902_10843_10059_10884_10887_321_322_10103%2Csearchweb201603_59%2CppcSwitch_0&algo_pvid=f5cff3e2-8f46-41ac-ae2b-e1457b82ac3b&algo_expid=f5cff3e2-8f46-41ac-ae2b-e1457b82ac3b-6


6x 1w blue led (15-25lm) (300mA-350mA) (3,0V -3,2V)
18x 1w red led (40-50lm) (300mA-350mA) (3,0V -3,2V)

If you know some LED alternatives within the pricerange of 20$ for all LED's:
Blue needs to be 450nm
and Red 650nm

This Driver i would buy:
MW LPV-35-24   ... LED-Driver, 36 W, 24 V DC, 1500 mA.

So the Resistor should be around 50 Ohm.

I would choose a parallel circuit with a Series circuit.
The Example belove.



If you have some better opinions about a diy grow led please let it me know.

Thanks for your help.
« Last Edit: March 03, 2019, 01:42:16 pm by Irukandji »
 

Offline madires

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Re: grow led diy
« Reply #1 on: March 03, 2019, 02:09:16 pm »
Beware of Chinese Watts. >:D If the LEDs are fine then I'd order a few more as spares. Also I recommend to run the LEDs at a lower current (70-80%) than rated and to provide sufficient cooling (large heatsink). This way you'll get a LED light with a reasonable lifespan. I've built a few myself, e.g. for a fish tank.
 
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Offline Irukandji

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Re: grow led diy
« Reply #2 on: March 03, 2019, 02:24:55 pm »
Thanks for your reply  :),

whats about the lumen output of the Led? Is it a lie or close to the specification of the lumen output? You know some alternative Led's?
What about the Driver should i buy some other? I will order atleast 40 red and 20 blue.

Which Driver would u prefer for the 3W Led's same Setup?
« Last Edit: March 03, 2019, 03:00:31 pm by Irukandji »
 

Offline madires

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Re: grow led diy
« Reply #3 on: March 03, 2019, 03:13:59 pm »
Same as Chinese Watts. ;) The only way to be sure is to measure the lumens. I can't recommend any specific no-name LED because you get the cheapest available in Shenzhen. No, a MEAN WELL driver is a good choice.
 

Offline Jan Audio

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Re: grow led diy
« Reply #4 on: March 03, 2019, 03:35:02 pm »
I like to make a grow LED also, for the PSU i would shenzen not for the LEDS.
I have this galvanic wire for the LEDS.
And i will buy Cree LEDS only.
I dont think Cree have diffuse LEDS, i dont know if its needed or not ?
For the power i will use switching for each LED plane, so can have many LEDS from the same power, i dont know if its good or not to grow.
Now i go smoke thanks to you.
« Last Edit: March 03, 2019, 03:39:10 pm by Jan Audio »
 

Offline Irukandji

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Re: grow led diy
« Reply #5 on: March 03, 2019, 05:21:26 pm »
@ Jan Audio

What PSU u use? any link?
What cree led u will use? Link?
Thanks

How to calculate the driver for a single Series circuit. Like the one in the picture belove.
He use 3w LED.



Link for the video. The explanation is to short.



Anyway i got it.
« Last Edit: March 03, 2019, 06:59:46 pm by Irukandji »
 

Offline Irukandji

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Re: grow led diy
« Reply #6 on: March 04, 2019, 02:02:07 pm »
Hi

if i use the 3w 700mA leds, could i use a driver with max 700ma for one row or do i need some more output like 800mA?
For this example i will not use the voltage of the led and driver. :popcorn:


Driver:
MW APC-35-700
« Last Edit: March 04, 2019, 02:17:30 pm by Irukandji »
 

Offline Zero999

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Re: grow led diy
« Reply #7 on: March 04, 2019, 02:45:36 pm »
Hi guys,

i'm new to the Led subject and i have some questions about my Project. I want to build my own diy grow lamp.
My Problem is that i'm not sure if the calculation is wrong or not. My other question is are there some alternatives instead of my choosen led's.

LED from China all in all $18 for the LED`S for 60 LED's.

Here is the link of the LED's :  https://de.aliexpress.com/item/10-st-ck-UMAKED-High-Power-1-Watt-3-Watt-LED-Chips-Lampe-Licht-SMD-Warm/32847256118.html?spm=a2g0x.search0104.3.43.48e34ec4bEGrJX&transAbTest=ae803_3&ws_ab_test=searchweb0_0%2Csearchweb201602_9_10065_10068_10547_319_317_10548_10696_10084_453_10083_454_10618_10304_10307_10820_10821_537_10302_536_10902_10843_10059_10884_10887_321_322_10103%2Csearchweb201603_59%2CppcSwitch_0&algo_pvid=f5cff3e2-8f46-41ac-ae2b-e1457b82ac3b&algo_expid=f5cff3e2-8f46-41ac-ae2b-e1457b82ac3b-6


6x 1w blue led (15-25lm) (300mA-350mA) (3,0V -3,2V)
18x 1w red led (40-50lm) (300mA-350mA) (3,0V -3,2V)

If you know some LED alternatives within the pricerange of 20$ for all LED's:
Blue needs to be 450nm
and Red 650nm

This Driver i would buy:
MW LPV-35-24   ... LED-Driver, 36 W, 24 V DC, 1500 mA.

So the Resistor should be around 50 Ohm.

I would choose a parallel circuit with a Series circuit.
The Example belove.



If you have some better opinions about a diy grow led please let it me know.

Thanks for your help.
You've got the resistance value wrong.

For a string of six blue LEDs:
R = (V-VF)/IF
V = 24V
VF = 6*3 = 18V
IF = 0.3A
R = (24-18)/0.3 = 6/0.3 = 20Ohm

Those forward voltages for the red LEDs don't look right to me. Red LEDs have a lower forward voltage, than the blue ones: 2.0V to 2.2V.
To save power, use two series strings of nine red LEDs.

R = (V-VF)/IF
V = 24V
VF = 9*2 = 18V
IF = 0.3A
R = (24-18)/0.3 = 6/0.3 = 20Ohm

Hi

if i use the 3w 700mA leds, could i use a driver with max 700ma for one row or do i need some more output like 800mA?
For this example i will not use the voltage of the led and driver. :popcorn:


Driver:
MW APC-35-700
That's a constant current driver, which is perfect. Use half the number of 700mA LEDs connected in series, using the MW APC-35-700 and no resistors. The MW APC-35-700 efficiently limits the current, without any power being wasted in resistors.
« Last Edit: March 04, 2019, 02:52:01 pm by Zero999 »
 

Offline Irukandji

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Re: grow led diy
« Reply #8 on: March 04, 2019, 03:12:00 pm »
Thank for your help!

If u look on the video above he set all of his Leds in one row. There are blues and also Red LED's in and i'm sure they use different voltages as u said. I also checked the data sheet of the LEDs and u right about the specification.

So how he can manage all his LED in only one row?


Also i only need 700mA Driver for 700mA led's? I rad about a prozentage about 10%-20% above the max of 700mA. So the Driver should have around 800mA? I'm right?
(Sorry for asking again but im confused about it)
« Last Edit: March 04, 2019, 03:21:24 pm by Irukandji »
 

Offline Jan Audio

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Re: grow led diy
« Reply #9 on: March 04, 2019, 03:41:30 pm »
No i dont have PSU and i wanted to buy normal 5mm LEDS, not just a few, a whole lot, i dont know if its better, i just had this idea in my head, maybe a few 3W LEDS are more efficient then ?, saves a lot of soldering for sure.
 

Offline Zero999

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Re: grow led diy
« Reply #10 on: March 04, 2019, 04:35:30 pm »
Thank for your help!

If u look on the video above he set all of his Leds in one row. There are blues and also Red LED's in and i'm sure they use different voltages as u said. I also checked the data sheet of the LEDs and u right about the specification.

So how he can manage all his LED in only one row?
It's not convenient for me to watch the video at the moment, so I can't comment on it.

Quote
Also i only need 700mA Driver for 700mA led's? I rad about a prozentage about 10%-20% above the max of 700mA. So the Driver should have around 800mA? I'm right?
(Sorry for asking again but im confused about it)
No, if anything, to prolong the life of the LEDs, driver should be rated for slightly less than their maximum current rating.

The best way is to use one constant current driver with all of the LEDs connected in series and no resistors. The maximum output voltage of the LED driver should be greater than the sum of the LED forward voltages.
 

Offline Irukandji

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Re: grow led diy
« Reply #11 on: March 04, 2019, 05:34:40 pm »
@ Zero
thanks again i think i got it now. So the mA can be the same as used (700mA Driver for 700mA LED) but the volateg should be above the sum of the LED's in a row (2xLED(3,2V) = 6,4, the driver should have 8V).


Who ever added the comment about the mol per day thx for that!!!
If you dont want to post here pls mail me private :D
« Last Edit: March 04, 2019, 05:42:52 pm by Irukandji »
 

Offline Irukandji

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Re: grow led diy
« Reply #12 on: March 06, 2019, 01:11:06 am »
Hi there i have one more question.

I have choosen two different LED manufactorer.
The First one are the chinese no Name LED with 3W and the seconds are from Osram a well know manufactorer.

3W Deep Red 660nm 2.4-2.6v 700mA 60-70lm
3w royal blue 440-445nm 3.2-3.6v 700mA 30-40lm

(I cant find any lumen specification or how to calculate the mole)
High Power LED OSRAM OSLON® SSL 80 660nm hyper 3W
High Power LED OSRAM OSLON® SSL 80 451 nm deep blue 3W

Who of them are better? I know its a stupid question but maybe someone tested both of them.
« Last Edit: March 06, 2019, 01:12:45 am by Irukandji »
 

Offline daniel444

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Re: grow led diy
« Reply #13 on: March 06, 2019, 11:23:10 am »
i have built a grow light using 4 of these in series
https://www.digikey.com.au/product-detail/en/bridgelux/BXRC-40G10K0-B-73-SE/976-1581-ND/6557083
mounted on a heatsink i got from a large solar inverter scrap
they use poke in wire connector , i prefer the solder connector but these are cheaper
they have 90cri and people are successfully using them in grows , more pleasant to the eye

i recommend you put 2 of them in series on a large heatsink  , the heatsink is the hardest part to find , try to get a large used one
for the driver something like this
https://www.digikey.com.au/product-detail/en/mean-well-usa-inc/ELG-100-C700/1866-1472-ND/7702924
 

Offline Zero999

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Re: grow led diy
« Reply #14 on: March 06, 2019, 11:49:45 am »
Hi there i have one more question.

I have choosen two different LED manufactorer.
The First one are the chinese no Name LED with 3W and the seconds are from Osram a well know manufactorer.

3W Deep Red 660nm 2.4-2.6v 700mA 60-70lm
3w royal blue 440-445nm 3.2-3.6v 700mA 30-40lm

(I cant find any lumen specification or how to calculate the mole)
High Power LED OSRAM OSLON® SSL 80 660nm hyper 3W
High Power LED OSRAM OSLON® SSL 80 451 nm deep blue 3W

Who of them are better? I know its a stupid question but maybe someone tested both of them.

The trouble is you've not provided part numbers. The lumen output for the no name LEDs might be a bit optimistic.

I Googled for OSRAM  OSLON SSL 80 and found the following relevant links. The test current is 350mA, but they're specified up to 1A, although I wouldn't recommend running them at such a high current continuously.
https://www.osram.com/apps/product_selector/#!/?query=*&sortField=&sortOrder=&start=0&filters=productbrand,OSLON,SSL,80&filters=productbrand,OSLON,SSL&filters=productbrand,OSLON&deeplink=

https://www.digikey.com/catalog/en/partgroup/oslon-ssl-80-leds/53317

« Last Edit: March 06, 2019, 01:46:24 pm by Zero999 »
 

Offline Irukandji

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Re: grow led diy
« Reply #15 on: March 15, 2019, 08:27:45 pm »
Sorry for the late response.

Thanks for your feedback so far.
I found these LED's on ebay, but im not sure if they have enough power for my little grow box.
Link
https://www.ebay.com/itm/10-x-High-Power-LED-OSRAM-OSLON-SSL-660nm-hyper-red-Platine-3W-Pflanzenwachstum-/172846213449

All in all its for some garden plants like Physalis, paprika and chili.
The box size is 90 x 60 x 60 cm. Im not quite sure if i get enough light out of my LED' stripes. They running with 5050 smd LED's.

Link:
https://www.ebay.com/itm/5pcs-SMD-5050-LED-Grow-Light-Strip-Lamp-for-Indoor-Veg-Flower-Plants-Hydroponic/264077183863?hash=item3d7c3a0b77:g:Mn4AAOSw3fxcCiz-&frcectupt=true




 

Offline honeybadger

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Re: grow led diy
« Reply #16 on: March 15, 2019, 11:25:21 pm »
Why do you want RED-BLUE combo? I guess it is obsolete, go full spectrum, all plants will benefit from that. Bellow 4000K for bloom, above 4000K for greens.

You can use for example these PROLIGHT OPTO PACE-28FNL-BC4P. If you drive them at around 10W each you will get 200lm/W - it is comparable with most efficient and most expensive grow lights.

And for 90x60x60 you will need a LOT of power so don´t be surprised. I guess at least 100W for blooming plants. A sunny day outside is 100k-200k lux - you can calculate how much lumens you need for your box. It is a LOT :)
« Last Edit: March 15, 2019, 11:30:59 pm by honeybadger »
 

Offline Zero999

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Re: grow led diy
« Reply #17 on: March 15, 2019, 11:34:01 pm »
I thought plants grow best with mostly red and a little blue light. I'm aware that other wavelengths are often useful, to instigate flowering and fruiting, but not most of the time.
« Last Edit: March 16, 2019, 07:53:13 am by Zero999 »
 

Offline honeybadger

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Re: grow led diy
« Reply #18 on: March 15, 2019, 11:39:17 pm »
The blue-red combo it is most useful for chlorophyll only but there is a lot more.
Check this: https://en.wikipedia.org/wiki/Photosynthetically_active_radiation#Yield_photon_flux
 

Offline thedoc298

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Re: grow led diy
« Reply #19 on: March 16, 2019, 02:29:04 am »
For a string of six blue LEDs:
R = (V-VF)/IF
V = 24V
VF = 6*3 = 18V
IF = 0.3A
R = (24-18)/0.3 = 6/0.3 = 20Ohm

20 ohm                            ^^^^
 

Offline nowlan

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Re: grow led diy
« Reply #20 on: March 16, 2019, 03:28:06 am »
I have a cob led over my reef tank, driven by 700ma meanwell LPC driver, and passive cpu heatsink.
https://www.digikey.com/product-detail/en/bridgelux/BXRC-30E4000-F-23/976-1255-ND/5180227

 

Offline james_s

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Re: grow led diy
« Reply #21 on: March 16, 2019, 06:42:57 am »
Lumens are essentially meaningless for non-white light anyway, and the specs on random Chinese LEDs are usually just made up numbers having little to no relation to what the parts are actually capable of. Some of them are quite good, others are not, you can't really tell from the specs though.
 

Offline Zero999

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Re: grow led diy
« Reply #22 on: March 16, 2019, 07:55:37 am »
The blue-red combo it is most useful for chlorophyll only but there is a lot more.
Check this: https://en.wikipedia.org/wiki/Photosynthetically_active_radiation#Yield_photon_flux
I know, but I maintain blue and red are the most important colours. It depends on the application. If he's just trying to suppliment existing natural light i.e. grow plants indoors near a north facing window, then I don't see why red and blue LEDs won't do.

And I've corrected my previous post: plants need more red, than blue light, rather than the reverse.
 

Offline honeybadger

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Re: grow led diy
« Reply #23 on: March 16, 2019, 01:03:54 pm »
... I don't see why red and blue LEDs won't do...

It will look like in a whorehouse  :-DD . I had a DIY blue-red combo few years ago. Full spectrum is the only way.

And you won't be able to find most efficient blue and red LEDs. All the efficiency development is focused on white LED. And efficiency is the most important factor there is.
« Last Edit: March 16, 2019, 01:06:43 pm by honeybadger »
 

Offline Zero999

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Re: grow led diy
« Reply #24 on: March 16, 2019, 02:05:43 pm »
... I don't see why red and blue LEDs won't do...

It will look like in a whorehouse  :-DD . I had a DIY blue-red combo few years ago. Full spectrum is the only way.

And you won't be able to find most efficient blue and red LEDs. All the efficiency development is focused on white LED. And efficiency is the most important factor there is.
Who cares what it looks like?

Using separate red LEDs is more efficient because it cuts down on the losses when blue light is converted to longer wavelengths in the phosphor: look up Stoke's shift. Producing lots of green and yellow light is also wasteful because it's just reflected by the chlorophyll, rather than used for photosynthesis. If plants used green light for growth, then they wouldn't reflect it, so would be a different colour than green.
 


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