Help Me Choose a Suitable Conveter

Thanks for reading my post at first.
Can I ask you some advice on choosing the suitable electronics? Please excuse the noob question cause I am new to electronicsI want to power a large set of LED strips. I have calculated it the maximum output–120w at 5V.
I have researched it,I found that significant limitations in what I am trying to do.I have not found a wallwart capable of doing this. I have also found that using voltage regulators will produce too much heat, and would be dangerous. I have been searching transformers, but I am not finding this much help either.
Now I want to buy LS150-5 which produced by TDK-LAMBDA from site,however, because I will install this transformer in my home,so I need to be more caution.
Could anybody please point me in the right direction? I am looking for theory, as well as safety information.
Thanks in advance.