I ordered the "160" watt version also called "20 watt" for the supposed optical output. What I received is a laser that is only a 10 watt output. I know this because the 20 watt laser I received consumes exactly 3.54 amps and my 10 watt laser of the same brand consumes 3.54 amps also. They also have the same size laser housing/extrusion. The user manual and the laser housing conveniently leaves out important information such as model number, power output, etc. But, the user manual for this 20w laser does state that the power input is 3.5amp, (the same as the user manual for my 10watt, 3.5amp) !!! Interesting how you can get twice the advertised power output for the same power input! Buyer beware, something is fishy here. I used 2 different test methods and meters to verify the info above. Read more