H10 -- Principal source for lighting
173. Similarly, households usually have more than one source for lighting. In some urban settings, electricity could be one source supplemented by either kerosene or candles. In rural settings, it is kerosene, candles or wood. In each of these cases, therefore, you must find out which of the sources households use most of the time for lighting and record the appropriate code.

Section 2: Housing facilities

H10 What is your principal source for lighting?