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DIY LED-lighting

- Fri, 31 Jan 2014 09:09:43 EST 5NXy03ws No.6109
File: 1391177383025.jpg -(84957B / 82.97KB, 1024x768) Thumbnail displayed, click image for full size. DIY LED-lighting
So heres the situation:

I want to grow weed. Suprise. The system need to be extremely stealth because i got lot of neighbors and friends hanging around my apartment.

>no sound
>no smell
>no light leaks
>small size
>energy efficient

Ok so computer case is my best option. I can do activated carbon filter myself but lights are the main reason why im here. I dont know how to make my own LED-panel. Commercial lights are too big, wrong shape and they have build-in cooler which makes them noisy.

So heres the deal:

Can someone tell me how to make my own panel? Simple as possible. Blueprints and stuff you know.

Because setup is going to be in computer case and need to be noise free, watts need to be low as possible to keep heat down. Heat sink and small computer cooling fan need to be enough for the whole system.

What are the best way to go with this kind of setup? Few powerfull quality leds?

It would be cool also if you tell me some good shops in europe where i can get all what i need. Shoplist with links would be real great.

And btw Lowryder is the strain i got.

Here is something what it should look like

I really appreciate if someone be able to help. Thanks a lot.
M - Fri, 31 Jan 2014 12:27:15 EST 06ISvFUq No.6110 Reply
I don`t know if you need special leds for that or not, if you don`t. Buy LEDstrips, easy shaping and you can just attach them to the inside.
Lydia Drockleford - Sat, 01 Feb 2014 21:40:49 EST PLfeqw77 No.6111 Reply
op you are going to need to do a little home work, first off what led's do you want and in what cluster. the guy listed his in his build. how big is the thing going to be/what do you want the power draw to be. the guy listed his at 50w which is about the same as a regular light bulb or 2 cfls. you are leaving to many openings and asking for to much research.
Simon Genderfield - Mon, 03 Feb 2014 04:52:55 EST U0IJI7OT No.6114 Reply

Fist you'll need to look up what your plants really need. LED's only emit a really small spectrum of light. The intensity is also really important.

As for the analysis, you can use programs like DiaLux (yes it's free) to calculate the intensity of your light sources. I'm not sure if separate LED's are included as light source (maybe through plugins). But if they are you can calculate how much light your plants will get.

Finally you need to build everything. What you could do is use the 300W power supply from a basic computer. Voltages are 5 and 12 volts. Then you should calculate how many LED's you can place on every voltage.

Watch out what those fans do though. You don't want them sucking sand in your power supply. Your neighbours won't be happy when you burn down the building.
Oliver Brinnertack - Mon, 03 Feb 2014 11:46:55 EST CKZoWqYh No.6115 Reply
1391446015893.jpg -(368993B / 360.34KB, 1200x1600) Thumbnail displayed, click image for full size.
I did my Bachelor's Thesis about this in EE. LED-lighting for plants. We grew salad, though.
Oliver Brinnertack - Mon, 03 Feb 2014 12:04:09 EST CKZoWqYh No.6116 Reply
1391447049893.jpg -(39055B / 38.14KB, 750x245) Thumbnail displayed, click image for full size.
Here's the spectrum of the lamp.
For photosynthesis there are two peak values between 400-700 nm. The peaks are for red, 625-675 nm and blue for 425-475 nm, chlorophyll a and b.
11 pieces of 3 watt Philips LUXEON Rebel LEDs. 10 Red AlInGaP LED(628 nm) and 1 Royal Blue InGaN LED(470 nm). The proportion of red to blue light was calculated after some studies where they had examined to effects of different spectral compositions. Not enough blue causes the plant to grow too elongated. The amount of blue light needed isn't, however, a proportion but a nominal value of µmolm^(-2)s^(-1) that depends on the plant. If you want to aim for something that I saw in general then, 20% of blue light should be more than enough. Especially if you are going to do some secret grow-op.
In total photon flux we aimed for the recommended value of 170 - 200 µmolm^(-2)s^(-1). Micromol are used because photosynthesis and light reactions are quanticized so using Watt is quite useless.

I'm too lazy to translate my thesis to English, though.
Oliver Brinnertack - Mon, 03 Feb 2014 12:06:35 EST CKZoWqYh No.6117 Reply
1391447195893.jpg -(110346B / 107.76KB, 756x574) Thumbnail displayed, click image for full size.
To add to that, I have read studies where hemp produces more cannabinoids in the presence of UV-light. Spectral composition depends on the plant and affects stuff like taste and other aspects.
Oliver Brinnertack - Mon, 03 Feb 2014 12:09:20 EST CKZoWqYh No.6118 Reply
As for the build itself just use an aluminium plate like we did. In the center of the aluminium plate we measured a steady temperature of 51.9 Celsius which the LEDs can easily handle. For the optics, it depends on how you are going to build it. It's pretty basic geometry anyway so you should be able to handle it with the lens manufacturer data.
Oliver Brinnertack - Mon, 03 Feb 2014 12:11:21 EST CKZoWqYh No.6119 Reply
...aaand for the power source for the LEDs just get a constant current LED-driver. That way you don't have to calculate shit. Just solder, connect and let it be.
George Bingerfoot - Thu, 06 Feb 2014 20:41:06 EST BKcz5mkY No.6121 Reply
op me and a three other guys that are legit professional engineers are working on a mini fridge sized weed incubator that can connect to the internet
George Bingerfoot - Thu, 06 Feb 2014 20:42:51 EST BKcz5mkY No.6122 Reply
what language? any respectful engineer should speak at least 2 languages
Edward Duckshit - Fri, 07 Feb 2014 19:14:28 EST 5NXy03ws No.6124 Reply
My friend can translate it to me so you can post it. Also anything else helpful you may have.
Doris Cricklespear - Mon, 10 Feb 2014 22:04:56 EST kU/b2Op8 No.6128 Reply
1392087896169.jpg -(20525B / 20.04KB, 591x370) Thumbnail displayed, click image for full size.
>The peaks are for red, 625-675 nm
the peaks are a the bounds of that interval, the interval is depending on the plant though. anyway, with the peak of the led somewhere in the middle shouldnt that be suboptimal? also, chlorophyl a is found in bigger amounts, afaict from wikipedia.
that pic shows plants can take a lot of bandwidth between red and green, here's another one. it alludes me, that little red and blue should be enough. some have linked raisin production quality to lighy quality.

for electrical egineering, what was the engineering part, did you design the psu? did you work with a biologist?

everyone does build led panels these days. doing it cheap and well is the hard part. needs a degree just for the cost analysis
Fanny Snodwater - Tue, 11 Feb 2014 07:25:49 EST CKZoWqYh No.6130 Reply
We tried to aim for within the peaks of chrlophyll a and b. Other wavelengths do affect the plant and all the mechanisms are not understood. I read a study from Sweden for example where green light affected the taste of herbs even though it should just bounce off when you think of it.
Illumination engineering here is a subset of electrical engineering. Designing street lighting, office lighting, plant lighting and everything involved with lighting basically.
We didn't work with any biologists but there are guys at the university who are researchers in plant lighting so they gave us some material and helped us out. For example this guy, a Ph.D. in EE who did it about plant lighting with LED. http://lightinglab.fi/personnel/ppinho.html
Fanny Snodwater - Tue, 11 Feb 2014 09:09:18 EST CKZoWqYh No.6131 Reply
A guy in our group did his bachelor about building a control and PWM-system for the lamp, though. Still, electrical engineering isn't only about power systems but includes a lot more.

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