re:luxeon led dimmer circuit

i am also working with some leds (lumileds superflux). My project is
to control a cicuit of leds that will be a parking light/turn signal.
The light while illuminated as parking light mode is set at one
brightness, and gets almost twice as bright when turn signal is on.
The only diagram i can findf for this particular circuit is
thishttp://www.hidplanet.com/dmiller/PWM.jpg
but being a beginner, im not sure how to construct this complicated
of a circuit. i know i should use pc board (or so ive been told)
but it is still pretty intimidating. Also, anyone know where i can
get a 15v zener diode??

.

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