> A relay likely won't work very long, if at all, under that kind of
> use.  So, I need a transistor of some sort, right?  Probably PNP,
> since I can't really interrupt the negative side and therefore have to
> switch the positive lead?  

PNP bipolar transistor, or P channel Mosfet. 
Have a google on "inrush current" with lightbulbs though.
Read the resistance when cold, LOTS more current flows then, than when
they warm up.

 


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