Again borrowing on experience from more hurricane power outages than we care to remember, when you have the various flashlights / lanterns etc. in use around the house, it is beneficial to place (common sense safety permitting) mirrors behind and or above illumination sources. It makes a dramatic difference, particularily when the room has darker decorating colors. Even tacking a white bedsheet against a dark wall behind a flashlight will increase the reflected light, although a mirror is much better. When using any mirrors or light backdrops, remember just how hot the source of illumination can be interms of possible fires / melting and/or heat stress fatigue on glass mirrors.

Regards,
Comanche7