LED'S produce red,blue and yellow light spectrum. the mixture kinda resembles a purple glow.
Here read this discription
168 LED GROW LIGHT BULB MIXED RED & BLUE 110V Screw Bas - (eBay item 220181625495 end time Dec-13-07 17:14:22 PST)
man i had my doubts about the aerogarden after seeing those plants im startin to feel better with it what setting did you set the aerogarden to for the grow?