Lowtech Graph lists low-tech options for every need of a home. Here you can compare them, find tutorials to build them, and link them together into a circular system. Why low-tech?
Light after dark. Modern lamps use so little that lighting is rarely the biggest load in a house, but it is the one people notice in a power cut. The options differ in what they run on, how much light they give per unit of energy, and whether they work with no supply at all.
Ranked by light delivered per unit of energy. Note these options serve different roles - mains or battery lighting for everyday use versus a human-powered lamp as an emergency fallback - so the comparison shows output, not interchangeability. Class-level theoretical ranges, as everywhere in this catalogue.