Anyway to make this info_null or just normal lights come on only when power is activated? Would make my map look a lot better if all these lights were to turn on than having them on at the start of the game.. 

I'm sure a tutorial has already been made but couldnt find one. Just wasn't sure if you could do the same for info_null

You can use 'light_electric'. If you scroll down a bit in this tut till you see "UPDATE, stock lights. No Scripting required" it's in there..

http://ugx-mods.com/forum/index.php/topic,5375.msg59578.html#msg59578