How to choose the better power supply and speculate their cost ?

How to choose the better power supply and speculate their cost ?

1.?????Power : the bigger power ,the higher cost .

2.?????Certification: whether they have related certification ,for example ,3C , UL and others.

3.?????Functional: for example, whether it with PFC ,can be dimming or not .

4.?????Shell: the bigger power, the thicker aluminum shell is. therefore , the heat dissipation depend on how thick the shell is .

5.?????capacitance: the bigger input capacitance, the bigger power. The quality of capacitance determines the service life.

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