Lighting powered by an AC to 12V DC 4pin Molex adapter?


 I'm making a gift out of a traffic light that I'm going to snazz up (paint red, replace lenses with stained glass, new lighting) And I'm going to use computer case lighting as I am familiar with it. As I don't want to use a psu just to power molex connectors I'm going to use this AC to 12V DC 4pin Molex adapter I'm going to have a set up something like this; molex on/off molex Red EL Neon LED Meteor UV lights-and another light of some kind maybe a liquid cold cathode I believe the adapter will be able to power this, however I'm not sure as I've never used one before so any input is greatly appreciated. I also need to know whether the on/off switch will be able to control the whole string?

Thank you