Compact and economical power supply with limited efficiency

For my LED projects I bought 2 pieces of network equipment. The big advantages are its compact dimensions and of course the low price. The stabilization of the voltage is good, my multimeter displays both at 0.5A and 1.2A at an output voltage of 12,1V at.

Against default, the efficacy which according to my measurements at 0.5 A is 70% and the maximum current of 1.25A rises to 78%. For full 15W power one has a little over 4W dissipation in power supply, making it already strongly heated, which must be considered during installation. For the price, but you can not complain, therefore 4 stars