Can this dimmer really handle 144W?
Can this dimmer really handle 144W?


144W at 24V = 6A.    

If you PWM a FET so it is on or off it will dim LEDs that are connected using constant current or with a series resistors.

10 milliOhm Rdson FETS are easily enough available.

Power dissipation when on = I^2 x R = 6^2 x 0.01 = 0.36 Watts.
MOSFETS with 5 or 2 or even 1 milliOhm omnn resistance are available. 
Even 0.36 Watt would be acceptable.
So, yes-maybe. ie it's possible to design something that would.
Whether it does is TBD.
The price is right to find out :-).