Astronomers are not against lighting at night. They have the same needs for quality lighting as everyone else. They advocate the best possible lighting for the task, with lighting designs that take into consideration all of the relevant factors such as glare control, energy efficiency, and the need for dark skies. Fortunately, everything that is done to minimize light pollution also saves energy because the efficiency and utility of the nighttime lighting is improved. Turn off lights when they are not needed.
Timers can be very effective.
Use the correct amount of light for the need, not overkill. Direct the light downward, where it is needed. The use and effective placement of well-designed fixtures will achieve excellent lighting control. When possible, retrofit or replace all existing fixtures of poor quality. In all cases, the goal is to use fixtures which control the light well, minimizing glare, light trespass, light pollution, and energy usage.