why wire a dimmer module in 3 wire instead of 2 wire

[Guest alexk]

could someone explain the benefit of wiring the FDG211 in 3 wire configuration instead of the simpler two wire?

thanks

[Guest alexk]

ok i think i figured it out. in 2 wire it only works as a switch. can someone confirm this?

if the answer is yes can someone let me know if it can switch energy saving light bulbs?

(i understand that as a dimmer module you shouldnt connect the energy saving type as it might cause them to go boom since they always operate a little like dimmers)

[smartronix 0]

In two wire it also works as dimmer.

In most cases you dont have the 3th wire, so this helps you to setup faster, because you don't have to pull a 3th wire to youre switch.