First, you flip one switch on. Wait for let say 5 to 10 minutes. Flip
down
that first switch and now flip on a second switch. Enter the room and
touch
either of the two light bulbs that's not on. The "warmer" one of course
corresponds
to the first switch while the "cooler" one corresponds to the third
switch.
The light that is currently on obvioulsy corresponds to the second switch.
BINGO!!