Detailed simulations of lighting and HVAC energy consumption were performed on a prototype office building in six North American climates. The goal of these simulations was to calculate the overall energy savings attributable to reductions in lighting power density (LPD) from 25.8 W/m (past practice) to 17.2 W/m (current code) to 8.6 W/m (low). Results showed that as LPD decreases, reductions i...

This project is implemented on ARM, the sensor which detects the day light is used to switch outdoor lighting and the PIR sensor which detects the entering person into room are used here to regulate the indoor lighting intensity, which is done through PWM shifting technique. Saving the electricity is not difficult. Just by turn off the light when leaving the room, turn off computer when finish ...

LED-based lighting systems have introduced radically new possibilities in the area of artificial lighting. Being physically small the LED can be positioned or embedded into luminaires, materials and even the very fabric of a building or environment. Together with new functionality and flexibility comes complexity; the simple light switch is not anymore sufficient to control our light. This work...

geboren te Puyang, China. Subject headings: light emitting diode / illumination pattern / illumination sensing / frequency division multiplexing / lighting control / signal processing Cover design by Jieyin Cheng c 2010 by Hongming Yang, Eindhoven v vi Samenstelling van de promotiecommissie: Solid state lighting, employing high brightness light emitting diodes (LEDs), is becoming increasingly w...

Dynamic envelope/lighting systems have the potential to optimize the perimeter zone energy balance between daylight admission and solar heat gain rejection on a real-time basis, and to increase occupant comfort. Two side-by-side full-scale offices in Oakland, California were built to further develop and test this concept. An automated venetian blind was operated in synchronization with a dimmab...

LED-based lighting systems have introduced radically new possibilities in the area of artificial lighting. Being physically small the LED can be positioned or embedded into luminaires, materials and even the very fabric of a building or environment. Hundreds of LEDs can be used in a single luminaire or space, of which could also have different light output properties. The light switch therefore...