There are several different types of emergency lighting.
Here are the basics:
Battery powered lanterns provide the best light
for most rooms. However most of them take a lot of batteries, so you
cannot depend on them for long term use unless you have a lot of battery
Most of the type 4-8 D size batteries. They are a safe and
effective way of lighting a room on a temporary basis.
Propane lanterns work well, but they use a lot of propane so you
can't count on them for long term storage unless you have a lot of propane.
Liquid Gas Lanterns
You can also purchase liquid gas containers.
However, they are used mostly for camping and not as safe indoors. They
are not as easy to start as propane, and need more maintenance, as they are
refilled and not disposable.
You will need flashlights to walk around your home when it gets dark.
You can buy and store batteries, but you will need to rotate them so they don't
You can also buy flashlights that you can shake or wind and get light that
lasts for a few minutes.
Everyone has candles. They are probably the best long term solution for
light. Just be sure you have a holder for them so they won't fall over and
start a fire. Candles are almost always the cause of home fires during
power outages, so be very, very careful.
You also need to have enough matches,
and keep them stored in container where they won't get wet.
If you live in an area that received a lot of sunlight,
you can place solar lights in your yard during the day, and then bring them
inside during the evening.
During the winter, you will also have light from
your fireplace or wood burning stove.