Gas lighting explains why a large number of older gas lamps have been converted to electricity. Solar-rechargeable battery-powered gas light controllers can be easily retrofitted into existing gas lamps to keep the lights off during daylight hours and cut energy consumption and green-house gas carbon emissions by 50%. The use of natural gas (methane) for "indoor" lighting is nearly extinct. Besides producing a lot of heat, the combustion of methane tends to release significant amounts of carbon monoxide, a colorless and odorless gas which is more readily absorbed by the blood than oxygen, and can be deadly. Historically, the use of lamps
Gas engine 1-hour rating, 12-hour rating and continuous rating) where as the gas engine will generally only have a Continuous rating, which will be less than the Diesel Continuous rating. Various ignition systems have been used, including hot-tube ignitors and spark ignition. Most modern gas engines are essentially dual-fuel engines. The main source of energy is the gas-air mixture but it is ignited by the injection of a small volume of diesel fuel. Gas engines that run on natural gas typically have a thermal efficiency between 35-45% (LCV basis)., The best engines can achieve a thermal efficiency of slightly more than 48%