led’s 12v in parallel

Hey, new here and I had a question about wiring some LED's to a 12v source. Me and my friend are designing a brake light for his motorcycle. Anyways, my main question was if I can wire them in parallel like the following diagram using a single resistor. I ohms law with the equation (V1-V2)/I * N V1=Supply (12v) V2=Volts for an individual LED (3.5v) I=Current for an individual LED (.020a) N=Number of LEDs in parallel circuit (12) Is this diagram and equation correct. Would this setup work hooking up to a 12v battery on a motorcycle. Thanks :-)

four rows of three led's with 820 ohms resistance on each row attached to negative side. http://led.linear1.org/led.wizThe wire I'm test'n isn't doin' what it's supposed to be doin'... I am so glad I printed that tech sheet, with the wrong info.

Do it right the first time... or I might have to fix it for ya

My question though is would this work. This website: http://www.quickar.com/noqbestledcalc.htm shows the same schematic I came up with and so does this one: http://www.hebeiltd.com.cn/?p=zz.led.resistor.calculator Would this setup work??