Tony you dont have to install the resistor and the bulb either one will work alown. If you install the resistor you don't need the bulb. The resistor is there incase the bulb burns out so the system will still work. So really you dont have to put in the bulb. A bulb is nice to have tho.
Good Luck!

I didn't do it, no one saw me do it, you can't prove anything! "Bart Simpson"