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OfflineMateo
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Homemade DIY growlight
    #25033733 - 03/02/18 03:55 PM (4 months, 13 days ago)

Anyone tried to disassemble a cheap china growlight LED and use the LED beads and driver to make a new growlight?
I would need something with the leds spread out on a larger surface, something to replace a T5 tube fixture, 4 foot x 4 tubes.

A cheap china 1200W LED is 50Euro and has 120 x 10W led beads.
If one spread out say 200Watts of leadbeads on a 120x50cm area that would be great.
Its like doubble the light compared to a T5 fixture and i could make 6 of em from one china led.
Anyone tried something similar?


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Invisiblevatman
I'm Vatman


Registered: 04/17/14
Posts: 1,575
Re: Homemade DIY growlight [Re: Mateo]
    #25038736 - 03/04/18 07:11 PM (4 months, 11 days ago)

Going to want a 90 Degree limiting lenses


PCB diodes. Most current grows use 5w diodes. Cree 10w diodes will give you a lot more light per watt.

Your driver choice will determine how you wire your LEDs.

A heatsink

An old or new computer case fan

2 part Arctic Silver Alumina Premium Ceramic Thermal Adhesive

Wire

Tools needed

Solder
Soldering iron
Flux as needed



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For the driver you have two options going High current, you would need to wire lights in parallel
Or getting a lower current high voltage driver and wiring in series.


So lets say you had a driver that was 2.1Amps, sometimes labeled as 2100mA had a voltage rating of 22-38 your LEDs are rated at 1.2A or 1200mA and a voltage of 2 to 2.2V

If we did 3 parallel branches we would be supplying 700mA to each leg (we are calculating at a perfect world theoretically they should have 0 Resistance after being forwarded biased.) Well we are running them a little cool, so if we wanted to run them brighter we can do

2 branches operating at 1.05A. So we are not above our maxim current rating.

So as this is a shitty chines LED lets say they are all poorly made and take 2.2V to operate.

38/2.2=17.2727273
So we can have 17 LEDs on each parallel leg. (On each leg the 17 LEDs are wired in saries. )

This one driver can driver a total of 34 LEDs.


Please note this was done for the specs of a red or yellow spectrum of the LEDs I listed above.
White LEDs and an operating current of 700mA. The closer you are to the rated current the shorter life you will have (unless you can keep the LED cool)

So lets say you used the same driver for the White or blue LEDs

We would use 3 parallel legs.
Each should have around 700mA
Blue 5W leds use 6-7V.
So 38/7=5.42857142857
So we can have 5 on each leg for a total of 15.


with this driver 250W You can have 50 blue, whites etc.

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The messy part of this is wiring. Especially if you want to mix the locations of the colors as they are not all the same current ratings. A PCB would fix this but would be costly to get the correct PCB and would require some drafting on your part.


Edited by vatman (03/04/18 07:39 PM)


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OfflineMateo
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Re: Homemade DIY growlight [Re: vatman]
    #25044548 - 03/07/18 07:06 AM (4 months, 9 days ago)

Thank you for the details vatman.

If i choose to go this route i probably can fix my own PCB.
That is if it´s enough with 2 layers, more i can´t do.
I´ve done it before and i probably etch it a home and not buy it as bigger boards tend to be more expensive.

One question though, why i want 90 degree lenses?
Isn´t this affecting the total area lit by the LED.
I do want a little larger area under the light and most LEDs i see uses the 120 degree lenses.
Maybe i have misunderstood the lenses altogether, must check this.


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Invisiblevatman
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Re: Homemade DIY growlight [Re: Mateo]
    #25047378 - 03/07/18 10:46 PM (4 months, 8 days ago)

Well, if you want to do a larger area than yeah go for 120.

Just you loose a lot of energy even with high reflective materiel bouncing it off walls etc.



You would have to do more research into that as I have not done too much into the 90 vs 120. Generally speaking you can get more coverage with a higher light at 90 but you are also loosing energy.  Could really just boil down to your application. Just you are going to focus or disperse your energy more depending on the angle.



Do you print your PCB or do you chemically etch it?


Edited by vatman (03/07/18 11:01 PM)


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OfflineMateo
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Re: Homemade DIY growlight [Re: vatman]
    #25050210 - 03/08/18 08:25 PM (4 months, 7 days ago)

To make our own PCBs we usually use H2O2 and HCL at strong concentrations and chemically take the copper away.
It works good.
I have not tried this Na2S2O8 stuff they sell now.

But they have stopped sell strong H2O2 openly here, you must get a permit now.
That sucks.
More rules and regulations, not good at all.


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Edited by Mateo (03/08/18 08:28 PM)


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