Does turning lights on and off throughout the day really conserve energy and save money? As a follow-up to the light-switch sticker effort, O&M reviewed a research study on lamp life conducted by the Electric Power Research Institute. Four-foot fluorescent light tubes will last 27,000 hours if their burn time equals nine or 10 hours a day. Turning these lights on and off throughout the day will shorten the lamp life, but the energy cost avoidance exceeds the cost of shortened lamp life. One fluorescent lamp, cycled one hour on and 30 minutes off throughout a 10-hour workday, would yield a cost avoidance of $1.38 annually. Even with increased replacement costs, the net cost-avoidance would still be $1.05 per four-foot lamp. Since there are about 500,000 fluorescent lamps on campus, the total cost-avoidance could amount to more than $500,000 based on the above scenario. Of course, conserving energy does not take precedence over safety. If lights need to remain on for safety or security reasons, users should act accordingly. In most cases, however, the message on the light switch stickers still applies ... "Not in use? Turn off the juice." The "Energy Conservation Corner" will be published every other month. Questions about energy-conservation programs or practices should be directed to Jeff Buenting at 333-1364 or firstname.lastname@example.org.