Making a glow pad, what size resistors?

[BrandonClaps]

i'm going to use 2 of these led's what size resistors do i need?

http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&product%5Fid=276-316

Wavelength: 468 nm (typ.), Type: T-1-3/4 (5mm), Lens Color: Clear, Viewing Angle: 30°, If mA: 20 (max.), Vf: 3.7 (volts typ.), Vf: 4.5 (volts max.)

[paceman]

I use 4000-6000 mcd in brightness for my glow pads. Two will work ok, but I would suggest at least four.

1/2 watt at 150ohm. It will work for either 12v or 5v.

I've had soom running for over a year without burning out.

[BrandonClaps]

what size resistor do i use for 2 led's and what size do i use for 4?

[FrozenLava]

get a 50 ohm resister at 3/8watt or 1/2watt.... 1/4 will work too, but doesn't really matter. the price diff is like $0.02
thats if your running on 5v.