The most common emergency is a power failure, and the most immediate danger and fearful situation from a power failure is being in the dark. Power failure also usually occurs with more severe emergencies and disasters such as storms, hurricanes, tornadoes and earthquakes. So, light sources are an important part of every emergency kit and should be a part of every emergency plan.
Possible sources of emergency light include light sticks (glow sticks), candles, solar powered lights, dynamo powered lights, and shake lights.