Arc Reactor

Regular price R 0.00

Our long awaited 2019 light…


The 75W Arc Reactor is aimed at scientists, experimenters, hackers, makers, and people interested in studying lights and their effects on plants. 

So far, it has been used to add supplemental wavelengths to larger growlight fixtures.

If you just want a small, efficient grow light, have a look at our QBv2 fixtures. 

3000K, 3500K, 4000K are great light spectrums.

But with the Arc Reactor, you can create custom spectrums, using super efficient Samsung, Osram and LG LEDs.

We'll release open source code and hardware, as designs develop.  We're working with the local guys developing the platform, for the Raspberry Pi, and will release our integration code, as it becomes available.

We will be focusing future plant lighting R&D around this, creating and sharing light recipes.  We'll allow the design to evolve. 

The light has finally been tested with its default spectrum, and we've found it to work well enough, with vigorous seedling and young adult growth, at 20W.  We haven't tested it full-cycle yet, but progress is good.


The Arc Reactor at full blast is 75W.


There are up to 6 channels to control:  

3000K (warm white) @ 22V

4000K (natural white) @ 11V

395nm (UV) @ 6.6V

450nm (blue) @ 11.4V

660nm (red) @ 12.3 V

730nm (infrared) @ 7.7V


We have various control options.


LED Details


  • LG UV 395nm (390-400 nm)
    • Radiant Flux: typ. 870 mW @ 500mA
    • Min 3.25V - Max 3.6V @ 500mA
    • Min 3.55V - Max 3.95V @ 1000mA
  • Osram Oslon SSL 120 Deep Blue 450nm (439-461 nm)
    • Radiant Flux: typ. 690 mW @ 350mA
    • Photosynthetic Photon Flux: typ. 2.57μmol/s
    • Radiant Efficiency: typ. 69 %
    • Min 2.75V - Avg 2.85V - Max 3.25V
  • Osram Oslon SSL 150 Hyper Red 660nm (646-666 nm)
    • Radiant Flux: typ. 425 mW @ 350mA
    • Photosynthetic Photon Flux: typ. 2.32μmol/s
    • Radiant Efficiency: typ. 59 %
    • Min 1.8V - Avg 2.05V - Max 2.6V
  • Osram Oslon SSL 150 Far Red 730nm (710-740 nm)
    • Radiant Flux: typ. 317 mW @ 350mA
    • Radiant Efficiency: typ. 46 %
    • Min 1.6V - Avg 1.95V - Max 2.3V
  • Samsung LM561C Warm White 3000K CRI 80
    • Luminous Efficiency: 210lm/W @ 65mA
    • Min 2.7V - Avg 2.75V - Max 2.8V
  • Samsung LM301B Natural White 4000K CRI 80
    • Luminous Efficiency: 223lm/W @ 65mA
    • Min 2.7V - Avg 2.75V - Max 2.8V


PCB size: Square PCB of 200x200mm, for use on 200x200x40mm heatsink.  2W fan advised, when running above 40W.



What is the purpose of this light?  Ultimately, to enable ‘citizen science’, and to make it easy for the community using these lights to share the valuable information and insights gained, at first by anecdotal grow journals, and eventually, by the power of computer vision and machine learning.


There are undiscovered light recipes that can maximize the nutrition, or taste, or speed of growth, and this light will hopefully be the impetus towards community collaboration. Information is valuable, and the more we share our findings, the faster everyone learns.


Are there other uses?  Yes, some growers just want to supplement their setup with additional wavelengths.



There is a wealth of academic information about the effects of different wavelengths and spectrums, on photosynthesis and photomorphogenesis, but finding and reading scientific papers is tough. NASA started the research on this topic in the 1980s, when LEDs were not very efficient, and they came up with the “blurple” grow lights, for growing lettuce in space. Though blue/red is efficient in low lighting situations, the trend in the past ten years has been towards white/red.


Most of the plant lighting science initiatives today take place at horticultural lighting corporations, like Osram and Philips, and at universities, typically working with expensive fixtures like the Heliospectra Dyna.


MIT has the OpenAg initiative (, which is based around their food computer, an incredibly complicated grow box. 


There are also at least a dozen commercial ‘GrowBox’ projects, some of which come with light recipes, in their app, specific to the plant you’re growing. They aren’t cheap.


In our opinion, there is just nothing out there for growers who just want to do some plant lighting science, on a budget.


Opportunity and Road Map


To start with, the control mechanisms are manual.
We have developed a way to control a single board from a microprocessor.
The best spectrum recipes can be shared.

Anyone who has done a bit of research on the internet knows that grow lights have about as much ‘fake news’ as politics.

Grow conditions and  can be logged and analysed


If you want to conduct lighting experiments, this is perhaps the light for you.  We are collaborating with other groups on automation projects, and are

This is our exciting new product. 


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