Panthor,
Don't forget to double check the polarity of the diodes and battery before you switch on. Those white LEDs have a peak reverse voltage rating of 5 or 6 volts... 9v applied the wrong way will kill them.
Fazerider the electrical genius strikes again.
Aww, shucks... but "smartarse" is what people usually say.
Apologies for being a pedant, but...
a) 4 x 220Ω resistors in parallel give an equivalent resistance of 55Ω,
and
b) 2 x 82Ω resistors in parallel give an equivalent resistance of 41Ω.
So ignoring forward voltage drop across diodes,
a) gives a current of 165mA and
b) gives a current of 219mA
I'm obviously missing summat here....
H
Then don't ignore the diodes.
Forward voltage drop with two diodes in series is roughly 7v, leaving 2v across the resistor.
The purpose of the resistor is to limit the current to 25mA, so the resistor needs to be 2/0.025=80Ω (the nearest preferred value being 82Ω).