"Oil lamps" refers to a type of lighting that uses oil as fuel to produce flames, providing light in traditional or older times before electricity. Full definition
The spacious house, which is 7 km from the farmhouse, has no electricity but makes use of oil lamps for light. (travelground.com)
I'm a senior citizen but have never made a candle / oil lamp from vegetable oil. (sewhistorically.com)
Once illuminated by oil lamps, this light station has since been upgraded with the latest technology, and its light can be seen for nearly twenty nautical miles. (lighthouseinnbb.com)