Underwriters Laboratories would not approve. Exposed soldered connections, no enclosure, and questionable electrical engineering on an appliance that will be near water. Still, the power supply and LEDs run cool, and give intensely bright light.
We hang the lamp from a shelving unit in our living room. Underneath, we're sprouting Mustard Greens, Lettuce, Parsley, and Collards. At least a month more before Jersey thaws and we can put them in the ground.
The light is intentionally purple. I use only the red and blue channels, since those are (approximately) the frequencies of light that plants can use for photosynthesis. Adding green would give a more white color, but add nothing for the plants while burning more power.