When power is down and it's dark, you can still make photos.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/56196558@N08">Jakub T. Jankiewicz</a> from Bliżyn, Poland
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/jcubic/12092552485/">Kerosene lamp</a>