Forgot to add, for my aeroponic setup I use red and blue 1 watt crees that I power via a usb hub. The reds need a resistor but the blues don't. I cut the led part off of some of those cheapie LED USB reading lights, mounted a heatsinked LED (glued with arctic alumina adhesive) instead, and then I plug the led "units" into a powered CyberPower usb hub. I can flex the lights to point them whereever, so if a plant gets taller I can adjust the light to stay above it.
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