Candles are dangerous unattended and oil lanterns must use carefully chosen fuel to avoid toxicity. I used old Dietz kerosene lanterns after the Northridge earthquake with lots of ventilation. Chemical lights are a good option. I just secure a few in strategic locations; hallways,bathroom, outdoor staircases etc. You can walk away without worry, and they make excellent navigational points in a otherwise familiar setting. People should take extra care OUTSIDE during any power failure. It gets mighty dark ( wow, what are those shiny things in the sky?) and vehicle drivers after an emergency are even less aware of their surroundings ( us.)