Need some help with resistors

[nielsss]

I bought some LEDs and im not really good on what resistor i should use. I have the specs of the leds below

 

Technical Spec

Source Material: InGaN

Emitting Colour: Blue

Emitting Wavelength (nm): 465-470

Size: 5mm

Intensity (mcd): 6000-8000

Viewing Angle (deg): 20

Forward Voltage (mA): 3.0-3.2

Forward Current (V): 20-30

 

I want to connect them to the 5V source from the 360 HDD and I was just wondering what resistors i should use. Would and 82 Ohm be ok? or 100ohm or am I completely off?

[ICookModz]

82 Ohm Should be Fine

[nielsss]

Thanks man, bought some so I hope they work =)