In the past few decades, we have been accustomed to the light bulb, each bulb life of about 1000 hours. The energy crisis and the environmental movement in 1970s stimulated the development of more energy efficient technologies for each bulb life of about 1000 hours. The energy crisis and the environmental movement in 1970s stimulated the development of more energy efficient technologies in the past few decades, we have become accustomed to the bulb, the life expectancy of each lamp is about 1000 hours. The energy crisis and the environmental movement in 1970s stimulated the development of more energy efficient technologies for each bulb life of about 1000 hours. The energy crisis and the environmental movement in 1970s stimulated the development of more energy efficient technologies in the past few decades, we have become accustomed to the bulb, the life expectancy of each lamp is about 1000 hours. The energy crisis and the environmental movement in 1970s stimulated the development of more energy efficient technologies for each bulb life of about 1000 hours. The energy crisis and the environmental movement in 1970s stimulated the development of more energy efficient technologies in the past few decades, we have become accustomed to the bulb, the life expectancy of each lamp is about 1000 hours. The energy crisis and the environmental movement in 1970s stimulated the development of more energy efficient technologies for each bulb life of about 1000 hours. The energy crisis and the environmental movement in 1970s stimulated the development of more energy efficient technologies.