The basic design is a 2 dimensional array of alternating red and blue lights mounted to a piece of white foam board.
Here's a plot of the layout (generated in Octave of course):
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhQNOGZ0_VmjawUpGzwuPoF4TZH8bDndwYxn07OJdV8vp8mYGcPHNMVQ0OTmHtxeTTSxhtsMdDrDiZer9M4-kHsJGGKvbx_pWJM_taHcJefgVlYU_x8kubosH3HL9r2ECQqP5kySIch9EM/s400/led_board.png)
And here is the light board as built:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVddmekiXzuv7FT86c0E_o_oQmm1nMiM65fafkd_cEC0O4YZa1Mau1I_rnw-11m_yiEFxETF7A7eF9pLNevfvCl2nUtRLQuhdg1pgVHJt4Ox21GHYyaT5lYYugDh7i-nkfkNUH1XOB85Y/s400/led_board_asbuilt.png)
You'll notice two empty holes on the right hand side of the board, the wire between the lights was a really tight fit to meet the spacing I chose (should have checked that a little more closely before drilling all those holes).
Those mini-LEDs look pretty bright, but I'm not sure if it is producing enough light to actually grow a plant, might need to add a string or two. The packaging claims that you can safely plug 43 (!!) of the 60 light strings into a single outlet.
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