Pressure lamps. Why? Well, despite they should be dumped on roadside of progress, there is still few cases when they are actual. Massive blackout in cold period of the year for instance. Pressure/mantle lamps produces significant amount of heat as side-product and can work on variety of high flammable liquids, not only patented camp fuel. But odor is still the problem. However, when it&#039;s freezing-cold, who cares of smell, right? Interested? More in video from <a href="https://www.youtube.com/watch?v=D_qFWoa_HR4&amp;ab_channel=TechnologyConnections">Technology Connections channel</a>. P.S. stay away from suspiciously cheap mantles, or keep your Geiger counter on