heater fan and incandescent light bulb

I’m trying to make a incandescent light bulb throb using arduino and also I’m trying to make a heater fan speed up and slow down does anyone have any knowledge of the circuitry required to connect these main powered items to arduino outputs? I’m guessing some kind circuit using chunky relays?

thanks

Why not use I/O modules or solid state relays and PWM? http://en.wikipedia.org/wiki/Solid_state_relay

they will take a TTL input and switch a pretty big load.

cheers