Power Supply advice

liquidis54

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I'm building an arduino powered light. It's gonna have 3 sets of 3 leds. 6 blue on one channel and 3 white on another. http://www.stevesleds.com/3-up-Tristar--Seperate-Wiring--AntiDisco_p_266.html These are what I plan on using. I think to run 6 in series I'll need 18 volts but the arduino only needs 5 and the white channel will only need 9 volts right? How can I run the whole system off a single power supply and what size do I need?
 
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