What voltage adapter do I need for a 5 meter 5050 LED strip?
Assuming the 2A was correct, then you really cannot go wrong with the higher AMPS and more AMPS will not make the LEDs overheat. AMPS will simply provide more available current to the circuit. This can give you more scalability if you decide to add more lights later on. More AMPs does not translate to higher power consumption either.

Hopefully these illustrations help:




You could go seriously wrong, however, if you over-volt them and it will make them overheat or destroy them altogether. If batteries are involved then there may be some considerations about AMPs.

More reading:


Good info that directly applies to your question.
This is about speakers but the same principal applies.
This is also good info