Changing human behavior is hard, very hard. Using more energy efficient lights is not going to make a dent. Energy consumption keeps going up with more and more electronics getting used in every day life.
Things that will make a difference are a break through in Fusion power, more nuclear power plants until then. More electric vehicles. Switching cargo ships to clean hydrogen for fuel source, as well as trucks. Electrify the rail network and build high speed rail lines to replace domestic air travel. Develop roof tiles with built in solar panels and make them mandatory for new housing projects.