I always run traps a lot harder I have played 1e 2e 3.0 3.5 and pathfinder.
I like to run a string of traps if one go's off it sets up more.
a rune in a hall set to a rod of lighting bolt go's down once then is eaten by the rod again then in same hall a trap armed by the lighting.
In my mind if I was a bad guy I would make sure any coming throw my door die with out me lifting a finger.
in a lvl one all trap dc's should be 15 in a lvl 2-3 dc 18-20 lvl 4-5 20-23 and so on