On CBC Radio One, I heard some
very interesting advice from a blind man to those who are "light-dependent"
in Ontario (say my family in Toronto) who need to make it through the night
without electricity (and therefore light):

• keep doors open -- not half-open
• follow a wall with your hands
• clear your floor of obstacles
• grab the things you need for the evening to have close to you
• if you drop something on the floor, don't bend over to grab it. crouch carefully
  and use one hand to sweep the floor for the itme
• don't stick your hand out suddenly -- you might end up banging your fingers
  into an item; curl your hands before slowly lifting your hands