I'd like to build a PWM-controlled light circuit. Since I'm not an electrician, I want to avoid working with 230 V as much as possible. I imagined an Arduino (fPWM = 460 Hz) controlling a MOSFET which controls a 12 V LED or halogen light circuit.
However, I want a decent light intensity, so I'd need 60 - 120 W depending on chosen bulbs.
The problem is that when looking for 12 V source, I found out that some of them require certain minimal load (around 10-15 W). I don't know if the frequency of PWM is low enough for the power source to "see" two states or if it could damage the source.
So my question is: do I have to care specially about the power source or will any power adapter work?