Leave these fields empty (spam trap):
Name
You can leave this blank to post anonymously, or you can create a Tripcode by using the format Name#Password
Comment
[i]Italic Text[/i]
[b]Bold Text[/b]
[spoiler]Spoiler Text[/spoiler]
>Highlight/Quote Text
[pre]Preformatted & Monospace Text[/pre]
[super]Superset Text[/super]
[sub]Subset Text[/sub]
1. Numbered lists become ordered lists
* Bulleted lists become unordered lists
File

Sandwich


420chan is Getting Overhauled - Changelog/Bug Report/Request Thread (Updated June 12 [TaimaTV Update])
LED grow lights Ignore Report Reply
Eugene Pickledeck - Tue, 04 Jun 2019 15:55:11 EST ID:eEKf3h+D No.146702
File: 1559678111470.png -(246008B / 240.24KB, 590x478) Thumbnail displayed, click image for full size. 246008
Currently have a Sylvania SHP-T 400W GROXPRESS which works great from seedling to harvest but at the lower parts of the plant the buds remain rather small because of insufficient light. Thus i would like to supplement it with LED lights on the sides which will be placed around 10-15cm away from the plants. There isn't a lot of room.
I have looked around for LED lights that are around 50-100cm long at least but can't really find anything that fits. There are LED bars but they are not full spectrum.
Though i found one that's around 31 x 12 cm and rated 25W which might work.
Since they'll be placed so close i think i'll need a low wattage version so they won't light burn the plants.
Anyone has any suggestion where to find such thing? Also if anyone has an idea how to generate more light from the sides feel free to share.
Note:i'm not very familiar with LED lights.
>>
Sophie Sungergold - Tue, 04 Jun 2019 19:34:43 EST ID:uHoIBLKZ No.146703 Ignore Report Reply
Try searching here.

https://www.digikey.com/products/en/optoelectronics/led-lighting-cobs-engines-modules-strips/111

They have a ton of different stuff and you can filter it for whatever you're looking for. I'd suggest looking for something with poke in connectors so it will be easy to wire. Eb series gen 2 come in 1,2 and 4 foot lengths and have great efficiency and low cost. Some other samsung strips are also good and opulent americas makes some modules that use cree chips that seemed pretty good as well. Just make sure to get a heat sink and a power supply. Everyone uses meanwell power supplies but there are cheaper options if you don't care as much about efficiency/heat. heatsinkusa.com will cut you any size heat sinks you need.
>>
Clara Murdlock - Thu, 06 Jun 2019 14:03:46 EST ID:S69Ie05p No.146711 Ignore Report Reply
I can recommend these heatinks (30cm)
https://www.aliexpress.com/item/300-x-25-x-12-MM-Aluminum-Heatsink-Heat-Sink-Cooling-Fin-Fan-Cooling-Accessories/32819662415.html
Also these strips
https://octopart.com/sl-b8v1n60laww-samsung-89817904

The heatsinks a a little larger than the strips which you could use to build 30x30cm "panels" out of
If you have a 100x100cm tent you can then use 9 of those or build one large panel
You need a constant current LED supply
https://octopart.com/search?q=HLG-320H-C1400B
Should perfectly match a 1M tent. There are plenty of others in this series with different amount of power. These are high voltage supplys which enable you to connect all your strips in series (make sure current is below the current the led run on, underdriving is ok an increases efficancy, and the max voltage above the sum of all the strips)

This is more expensive than a chinesium burple panel but still way cheaper than a proper full spectrum commercially sold light. And it's on par with the best LED lights out there.

Just make sure you don't get electrocuted 229V of DC will kill you.
>>
Jack Merrynan - Thu, 06 Jun 2019 14:17:22 EST ID:EKVpS4df No.146713 Ignore Report Reply
>>146702
Many top their plants to make them compact and even, so they can be kept closer to the light
>>
Ebenezer Morringcocke - Wed, 12 Jun 2019 09:04:43 EST ID:+i3n9ptP No.146717 Ignore Report Reply
Thanks for the recommendations so far. I've been reading about electrical stuff and the way to determine what kind of power supply i would need but i'll ask some questions to clear up things:
Let's say i connect 3 of the listed strips(~12V, ~1.5A rated, ~20W -> 36V , 4.5A , 60W).
1) If i connect 3 of these strip in serial then the voltage will add up while all of them will conduct the same current. Is that right?
Likewise if i connect them in parallel to one power supply such as https://www.aliexpress.com/item/32825394579.html then the supply will only have to provide 12V but the currents will add up resulting in 4.5A minimum requirements?

2) In a serial connection,i assume the voltage sum must be within the range of what the supply is rated for(ideally it should be the same). Is that right? So in this case i would fry the LEDs(3pcs) with the driver that >>146711 linked,right?
To avoid that i would need to use a minimum of 10pcs of these LED stripes(10x12V which falls in the rated 114 to 229 Volt?
Likewise i could just use a supply that has less rated voltage range for 3pcs?

3) Read about voltage drop. Am i right to assume that in thise case it would be negligible thus eliminating the need for individual small power supplies?
As it can cause dimmer lights towards the end of the chain and they would eventually fail because of insufficient power.
Would this be a problem in this case and in case of 10pcs?

4) Aren't these AC/DC adapters https://www.aliexpress.com/item/32963514618.html essentially the same as the ones i linked in 1) ?
They seem to do the same thing but the ones that require more wiring are bigger thus they do something more i assume?

While we are at it , what kind of LED lamp would be the equivalent to my current 400W sylvania lamp? Should i just build one for myself,if so what guide should i follow?
>>
Ebenezer Morringcocke - Wed, 12 Jun 2019 09:07:49 EST ID:+i3n9ptP No.146718 Ignore Report Reply
>>146717
In 4) i made the comparion in case where each LED strip would have its own supply.
>>
Samuel Sonninghune - Wed, 12 Jun 2019 12:02:43 EST ID:S69Ie05p No.146719 Ignore Report Reply
>>146717
First: I did misread your OP and assumed you want to completely light the tent with LEDs.
Supplemental lighting is also possible with these kind of strips, I am even planning something similar, but that's nowhere finished and will require quite a bit of laser-cutting / 3d printing.

The concept is essentially this:
Use some sort of clip to attach the heatsinks to the rods of the tent, along the whole height from the top of the pots to the hight of the plants.

Regarding your questions:
No these power supplies do not work for these kind of strips. You need a constant current supply for these.
They have a rated current of 1.43A and you need a supply that always puts out this current and automatically adjusts the voltage to match it. It's a good idea to use one with a little lower current like 1A for instance for increased efficacy.

In the case where you still would like to use these strips/heatsinks in addition to your 400W HPS I'd use this one:
https://octopart.com/search?q=HLG-185H-C1050B

The strips above have a forward voltage of 11.1V x 16 you'd have 177.6V which is within the range of the supply.
At 1.05A you'd have 117.6V * 1.05A = 186.48W of additional LED lights.

This way you'd have 30x4 = 120cm supplemental lights.

According to this example you can also use more or less of these strips. The above example is based on the assumption that you want to maximize the yield you get out of the tent.

If you want to use one of the power supplies you listed above you need some of these strips on a roll. They are way cheaper but are less efficient and might not give you the result you are looking for.

But if you like to use them these would match the above heatsinks pretty well.
https://www.aliexpress.com/item/1-2-3-4-5M-LED-Strip-2835-240LEDs-m-480LEDs-m-DC12V-High-Brightness-2835/32947409084.html
They are pretty straight forward to use just make sure the supply has enough power to drive them.
The leds in them are certainly not high efficiency but if you don't really care that much about gram/watt and just want some supplemental lights you'd be fine.
>>
Samuel Sonninghune - Wed, 12 Jun 2019 12:22:10 EST ID:S69Ie05p No.146720 Ignore Report Reply
The easiest solution might be
4x https://www.aliexpress.com/item/32963514618.html (12V 3A version)
4x https://www.aliexpress.com/item/1-2-3-4-5M-LED-Strip-2835-240LEDs-m-480LEDs-m-DC12V-High-Brightness-2835/32947409084.html (1m Warm white 480LEDs/m)
12x https://www.aliexpress.com/item/300-x-25-x-12-MM-Aluminum-Heatsink-Heat-Sink-Cooling-Fin-Fan-Cooling-Accessories/32819662415.html

you'd still need to cut the strips to match the heat-sinks and solder them back together.
You might also get by with just using some extruded alu profile from the hardware store but real heat-sinks are definitely better if you want to invest the effort.
>>
Alice Shakeshit - Thu, 13 Jun 2019 05:14:12 EST ID:aWb7Y/oB No.146723 Ignore Report Reply
>>146702

Will ask here instead of starting a new thread for one question, I've been using shitty blurple lights for a while now and am looking to get something abit more quality, however I don't want to build my own because thats effort, are there any widely available, decently priced brands of LEDs with actual quality light that are pre assembled?
>>
Shit Pittingwill - Thu, 13 Jun 2019 12:23:24 EST ID:S69Ie05p No.146725 Ignore Report Reply
>>146723
Depends on what you are willing to pay.
If you want the current state of the art you could buy this
https://gavita.com/retail/products/gavita-pro-line-led/gavita-pro-1650e-led-ml

Gavita is the market leader for greenhouses so that's targeted at professionals so it's quite expensive if you are a homegrower.
1650.- MSRP
But if you can afford it and can recoup the costs somehow go for it.
>>
Shit Pittingwill - Thu, 13 Jun 2019 12:32:08 EST ID:S69Ie05p No.146726 Ignore Report Reply
As far as googling goes the Gavita is only available in North America (at least retail)
USD 1100-1200 before taxes.

There also seems to be a Chinese version. (on the right side there are a bunch of copycats even)
https://www.alibaba.com/product-detail/Gavita-Pro-1650e-LED-ML-grow_62009287915.html
caveat emptor
>>
Shit Pittingwill - Thu, 13 Jun 2019 12:49:02 EST ID:S69Ie05p No.146727 Ignore Report Reply
Grower's Choice ROI-E680
Seems to be the Chinese Gavita Clone using western branding.
The savings seem almost negligible considering the better quality LEDs and 5 year warranty of the Gavita though.
>>
Simon Greenman - Thu, 13 Jun 2019 16:54:31 EST ID:MBFQ0Lmu No.146729 Ignore Report Reply
>>146719
>>146720

Thanks man. Any comment on my question from before?
"While we are at it , what kind of LED lamp would be the equivalent to my current 400W sylvania lamp? Should i just build one for myself,if so what guide should i follow? "
First and foremost i want to decrease the energy usage by at leat 100W if possible while maintaining the current lumen capacity.
>>
Shit Pittingwill - Thu, 13 Jun 2019 18:16:55 EST ID:S69Ie05p No.146730 Ignore Report Reply
>>146729
A good 400W HPS has about 1.8 μmol s-1 per Watt the current state of the art when it comes to LEDs about 2.6 μmol s-1 per Watt.
That is about 70% the power requirement based on the number of photons in the 400 to 700nm range of light.
The LEDs have a better utilization of the spectrum so it might be closer to 60%

Based on that 240W of high end LED is probably equivalent to a 400W HPS.
Lights like the Gavita from above have another thing going for them:
They illuminate the canopy in a completely uniform way so the buds at the edges /corners of the tent will yield about the same as the ones in the center.
This can give you a yield gain a similar magnitude.
>>
Shit Pittingwill - Thu, 13 Jun 2019 18:24:32 EST ID:S69Ie05p No.146731 Ignore Report Reply
>>146729
Keep in mind that this is only valid if you are using high bin LEDs from a brand manufacturer like Samsung, Osram and Cree.
Cheap LED strips from China are realistically worse than a HPS in terms of PAR per watt efficiency.
>>
Eugene Foddlefuck - Fri, 14 Jun 2019 12:59:27 EST ID:MBFQ0Lmu No.146732 Ignore Report Reply
>>146731
Yeah i wouldn't cheap out on this one. It seems the Gavita MH3 which is 240W would work great for me. Thanks again for the help.
>>
George Haffingcocke - Tue, 18 Jun 2019 04:59:14 EST ID:SCy+6EdV No.146734 Ignore Report Reply
https://www.alibaba.com/product-detail/240watt-HLG-quantum-board-with-2_62081539877.html?spm=a2700.icbuShop.41413.30.1ef25a20Sm1mXv

kingbrite is legit


Report Post
Reason
Note
Please be descriptive with report notes,
this helps staff resolve issues quicker.