post-sunset authorisation query

[Donna Halper]

Maybe the rules changed or maybe I wasn't totally clear about them, but if 
you have a day-timer, how long can you stay on the air after sunset, and 
with what wattage?  I heard a daytimer on the air long after sunset tonight 
and they sounded as if they were at just about their full wattage-- I 
thought you can only use reduced power if you are on after sundown.  Do I 
have this all wrong?