How do oil lamps burn?

Brass Oil Lamps is based on three elements - the oil, wick, and the base. For optimal burning, the lamps need to be half full. The lack of the same means that the wick will dry out completely and consume more oil. When the fuel is low, the same will consume more oil.
Mustard oil and kerosene oil are two major Deepam oil types that help you get the best results from your lamp. Similarly, olive and castor oil can be used, yet these are expensive.