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Planty Happy Grow Light

75 Watt LED grow light

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I made this grow light over the last few months, because i just love having plants around me. In winter, my two windows just don't give enough light, so i built this one =) There are so many cheap (and bad!) products on amazon and ebay, which i didn't want to order, and i need nothing professional either. So i figured that i would just build it myself.
The perfect lockdown project, btw!

-Can be fed from 15V-28VDC
-Made with Lumileds SunPlus20 Series of horticulture LEDs
-Adjustable R,G,B LED string currents -> adjustable output color
-75W at full power

-Three temperature controlled Fans
-Fan's rotational speeds are synchronized, to allow for even more silent operation.
-XMC1100 microcontroller

-Shuts itself down if a fan is stuck, or if the temperature rises too high.

It is a work in progress and may contain mistakes, so i wont't release everything publicly. But contact me if you would like to have some advice/some schematics/some code =)

The DC-DC converters inside the light have spread spectrum modulation. This way, i expect to have less electomagnetical interference problems.

The computer fans are synchronized to within 1-2° of deviation. In the first few months, i didn't have this feature, and it was quite annoying to have the fans run at slightly different speeds. But now, it runs really silent and without any disturbing interferences between the fans

  • 1 × XMC2Go Infineon dev board for XMC1100
  • 48 × Lumileds SunPlus20 LEDs
  • 3 × 50mm Fans
  • 1 × PCB Electronic Components / Misc. Electronic Components
  • 1 × Perforated Board

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  • New Fans, and a cool optical effect

    t.oster9205/13/2020 at 20:24 0 comments

    The old fans were a noisy mess right from the start, so i exchanged them for some new ones. They run much quieter, and also they are white, which makes it possible to get a really cool effect by illuminating them with a LED. Have a look! The video is not slowed down; this really is what you can see when you view it with your own eyes. 

    Can you guess how i did this? ;)

  • Protective Glass and Near UV LEDs

    t.oster9204/28/2020 at 18:41 0 comments

    Recently, i added some protective acrylic glass in front of the LEDs. Before, i was afraid that some plants could grow into my lamp, if i don't pay enough attention - well, that's unlikely, but you never know. The glass doesn't seem to impact efficiency too much. 

    Acrylic glass does reflect about 8% of incident light (at 90° to surface), and almost 92% are transmitted. Of those 8% that are reflected, most will be reflected again by the white PCB, making a second attempt to pass the glass plane. This again will be 92% successful. In the end, the efficiency will most likely be reduced by 1-2%.
    On the plus side, the light distribution will be a bit more uniform, so shadows are not that harsh. 

    Also, i finally put some near UV LEDs onto the board. I don't think they will help too much in irradiating the plants, since the are really low-powered, but they're nice to have. 

    To have any effect on my plants, however, the UV LEDs probably should have some shorter wavelengths as well as more power. It has been shown that UVB radiation can alter the content of carotenoids in some plants: https://www.sciencedirect.com/science/article/pii/S1319562X10001063
    And those seem to work well as antioxidants in the human body: https://www.researchgate.net/publication/9035299_Antioxidant_activity_of_carotenoids

    So, UV light might be good to have, but i doubt that my weak UVA lights will have any chance of doing anything useful. But at least i can try to observe some differences.

  • New Lampshade

    t.oster9204/22/2020 at 19:20 0 comments

    The old lampshade was made from cardboard and aluminium foil. Just a quick and simple solution, but it didn't look too nice. So today, i finally cut out some aluminium sheets and drilled holes in them to make a new one - and it turned out quite nicely. 

    I might add some corner pieces in the future, but for now, it is good enough. At the corners, there won't escape too much light anyway, since it is blocked by the lamp frame. 
    Also, i might add one more bend to each of the shade pieces. This way, i could approxmiate a parabolic reflector a little better.
    Also, the shade needs a painting on the outside. Maybe black with a waterdrop effect. 


    First, however, i will work on the cooling system some more. I've got a really cool idea for a visual effect, which has something to do with the fans already being synchronized. But i won't tell too much, you have to be patient :P


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