Energy Efficient Lighting System Research Articles

Advanced energy-efficient lighting systems: Progress and potential

From a systems perspective, energy-efficient design should strive to minimize the energy and money required to provide the desired quantity and quality of illumination. A wide spectrum of technologies, design practices, and control strategies exists to increase lighting energy efficiency. We describe the state of the art in energy-efficient lighting (emphasizing field operating conditions rather than product test results) and give an overview of its benefits. We consider existing and emerging lighting components: lamps, ballasts, fixtures, controls, and design issues as well as other building systems and features with which lighting interacts, including HVAC systems. Estimates of the societal cost-effective potential savings from improving lighting energy efficiency range from 50 to 80% of direct lighting energy use in developing and industrialized countries.

The Impact of Energy-Efficient Office Lighting Strategies on Employee Satisfaction and Productivity

This project was designed to investigate the productivity, preferences, and affective impact of energy-efficient office lighting systems. Twenty four office employees were rotated in a counterbalanced order through three such systems and one standard control system, spending approximately an hour and a half in each. The subjects "worked" on five computer-presented performance tasks, responded to a questionnaire about their current mood, and evaluated the lighting system in each office-lab. There were significant differences between the lighting systems in terms of employee satisfaction. However, with the exception of a reading comprehension test, they had a relatively modest effect on the subject's performance on other cognitive/intellectual tasks of their overall affective state. The findings indicated that initial reactions to the lighting systems tended to dissipate over time, so that with continued exposure, the subjects adapted to the new lighting conditions and displayed very few changes in their performance or affective mood.

Energy Nomographs as an Educational Tool for Design of Energy Efficient Natural and Artificial Lighting Systems

This paper deals with energy nomographs as a graphic desiqn tool which calculates the annual energy consumption of architectural design projects and aids designers in making good decisions about various energy features used specifically here in the area of lighting or daylighting. Example calculations will show how quickly the tool can be used and how repetitive use can enhance the designer's intuition in the area of energy and lighting.