the modular pc psu high power led grow light

by:Getian     2020-08-09
Hi all, after successfully releasing my LED algae scrubber prototype, I decided to release some of my other experiments using high power 3w LEDs.
Here, I decided to create an indoor growth environment for some lightly hungry lemon trees I planted in the cold winter of the UK.
Since only a small piece of aluminum plate is left in the algae scrubber project, I decided to try to make a small grow light with the smallest possible 1 feet printing.
This inevitably leads me to the conclusion that I need an active (fan based)
The cooling system of the project, rather than relying on passive heat dissipation.
After thinking about this for a while, I realized that I actually had all the components needed for a convenient size prefabricated metal product. . . . .
Old knackered pc psu I lied about my house!
After some planning and a little patching, pc psu case light was born! !
That\'s what I did! !
1 x old PSU on PC with 120mm fan (
While the PSU does not need to work, the fan needs to work). Source -
Anywhere you can find the old PC
Friends, family, office IT.
They come easily.
You can try the PC stores that throw away the old ones and they are usually happy to help.
1 x Good size PC processor radiator with low profile (
Need to be installed in the PSU housing, do not hit the fan)Source -
Anywhere you can find the old PC
Friends, family, office IT.
They come easily.
You can try a PC store, they are usually happy to help you, they are throwing away the old broken PC.
15 x high quality 3w high power led with pcb source-
I use these EPILED and Bridgelux LEDs with decent chips that can blow out the common trash on ebay from the water with a good 3 year warranty which is reassuring
I am also very concerned about the thermal efficiency of the small plates I am using and I know that these decent chips will run cooler and brighter.
I used a mixture of 5 times deep red, 3 Times royal blue, 2 times bright red, 2 times fresh blue, 1 times cold white and 2 times warm white.
If you contact the website, they will be happy to mix a batch of 20 in any proportion you like for a single color of 20.
I can only put 15 on the plate in the end, but it\'s very convenient to have a few spare ones.
1 x constant current LED drive power supply-
I used one of the 28W constant current LED drivers.
This is the most powerful 600 mA driver I can find and comes with a 5 year warranty that you can\'t argue about.
Hot glue source 1 x tube-
My LED algae washer left this, but I got it here initially.
Again, I can\'t argue about the price and it seems to do a good job.
Say I\'m still looking for better glue as I know the cooler I can run these LEDs will send out brighter light.
4 x M4 screw and nylon thread nut source-
They have been purchased but originally purchased from the ScrewfixA low voltage power supply for power supply to 12 v fanSource
Found an old phone charger and used it.
Prob won\'t last long, but it\'s good for the prototype.
Some ordinary power flex of DriverSource-
Anywhere!
About 30 depending on the situation around you.
* Note that the project needs to use some basic wires and some power tools
The author assumes that anyone inspired by the project undertakes all necessary precautions at work and is not responsible for damage to personnel or equipment caused by information obtained in this article.
This article is for reference only.
First of all, I need to remove the house and remove the old power supply, which is a very direct process: 1.
I first unscrew all the small screws and head nuts that hold the two shells together.
This is very direct and requires only a small cross screwdriver. * Note -
If you decide to do so, make sure you keep all the screws and screws as they will be needed when you rebuild the case. 2.
Next, I cut off the various cables attached to the power supply.
I want to keep these as long as possible so that I can reuse them later when welding wires between LEDs. 3.
Finally, I remove the main body of the power supply and the circuit board from the housing.
Again, it\'s just finding all the screws and getting things out. BEWARE -
The edges of the board and the housing itself are very sharp, so I wear gloves when I do.
After removing all the switches hard with a pair of pliers, I now have a bunch of cables and fans on both sides of the case, as shown in the photo above.
The next step may be the trickiest step in the whole project, and it is possible to cause harm unless appropriate precautions are taken.
Needless to say, personal protective equipment is always worn out when I cut metal or use power tools. 1.
Anyway, I need to remove part of the bottom of the house.
This is done by drilling holes in all four corners of the bottom of the steel. NOTE -
I need to leave enough fixed space for the aluminum sheet, so I left a 15mm surround for the aperture I\'m making.
Also, I need to check if the radiator can also pass through the hole easily, which will be installed behind the aluminum plate that will be attached to the hole.
I then combine it with a jigsaw puzzle and a metal cutting bit, and then make the holes with a hand saw.
It\'s not a good way and mini
The grinder or something might be better, but I don\'t have one hand.
Please be careful again if you are following this.
Hard work, I made the lighting panel now. 1.
I first measure and cut the dimensions of the aluminum sheet to make it the same size as the outer dimensions of the housing.
Next, I marked the LED array I wanted and glued them together using hot glue.
I then use them as a single series circuit (see schematic)
Weld the cables I removed from the housing early in the project.
* Please note that the constant current driver has a voltage range.
The range of drivers I use is 30-
50 v, so I need to make sure that the LEDs in each circuit are total in this range.
FYI the led I use operates at the following maximum forward voltage, which is very high for the Power led. -Deep Red -2. 8v (800mA max)-Bright red -2. 8v (800mA max)-Bright Blue -4. 5v (750mA max)Royal Blue -4. 5v (750mA max)
Cool white and warm white4. 5 v (750mA max)4.
Finally, I used the hot glue again to stick the radiator to the back of the aluminum panel.
The lighting section is now complete.
So I quickly checked to see if the circuit is working properly and then went on to work.
All I need to do now is Bolt everything together and connect the driver. 1.
First of all, I drill holes in the aluminum sheet and the housing so I can go through the 4 x m4 machine screws and install the housing on the lighting board.
I added a few extra nuts between the plate with the light and the psu housing to increase the airflow around the edge of the plate and a little more under the radiator. 2.
I then had to complete the circuit by adding the driver and connecting the fan with the phone charger.
The cable is then drawn out to one side of the housing, and the joy of the old cable used to be 3.
Finally, when I removed the PSU to make a full unit, I screwed the whole thing together with the screws and nuts that were previously saved.
The rest is just running some tests to see how the LEDs work and then using the chain attached to the fan cover grill in order to hang these on my lemon tree.
As with any prototype, I can do a lot of improvements, especially with the airflow around the led, as the blue and white are still very hot.
I have the idea of turning the fan, making some kind of blinds, blowing the air over the surface of the LEDs and radiators.
I did some preliminary testing with another fan and the results were very positive.
Also, I realize that it is very easy to extend this prototype because you just need to install another module in the exact same way.
You can either use a disk of ally or not, but there are a lot of things I can do to improve it.
Speaking of ally, I think it is possible to have a slightly larger platform because that is not the real reason (
Apart from aesthetics)
Why the plate needs to be so big if the psu shell.
Maybe it should be done bigger but Anyway hopefully you can find an interesting idea and I think it looks close and my lemon tree loves it! Jack :)
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