Good information, but why does that power supply I linked to above have a CE mark on it and say "LED use only?" Also, how could you test it to make sure it is compliant? I'd love to know that. Does complaint mean ripple and etc are in spec?
The standards in question relate to EMC (radio interference) and safety, not functionality. The ripple voltage, for example, could be atrocious, but that wouldn't make it non-compliant from a legal standpoint.
To test it properly, you'd need to take it to an approvals lab where they'd put it in a screened enclosure, connect it to a load (which in this case is an LED lighting strip) and measure the radio emissions from it. It's also tested for its conducted emissions back up the mains cable, immunity to spikes, surges and drop-outs in the mains supply, and immunity to radio interference generated by other nearby equipment.
In terms of safety they'll look at things like electrical isolation between the mains and the low voltage output, the temperature of the case when it's under full load, flammability, current leakage to earth, and whether or not it's correctly marked with voltage and current ratings, type of fuse and so on. A lot of the process is about paperwork.