Hybrid Lighting Systems - Day light Harvesting

INTEGRATED HYBRID DAY LIGHTING SYSTEMS:

The integration of artificial lighting with daylighting will provide a hybrid lighting solution that is more effective than conventional systems.

Overview

Many technologies have been evolved in the past few years to improve energy efficiency in lighting as it constitutes 25-30% of total energy consumption in a building. These technologies can be broadly classified as

Ø Conversion from inefficient incandescent lamps to most energy-efficient LED, T5 lighting systems.

Ø Implementation of smart lighting controls

Ø Utilization of maximum daylighting

A considerable amount of lighting energy has been saved with the implementation of the above mentioned technologies, but still there exists a potential to fine-tune the energy consumption through optimum integration of these technologies. ”Integrated Hybrid Daylighting System” is the concept originated from the above idea wherein the system works on a central theme of daylight and controlling artificial lighting installed in the same unit according to it.

Components 

Ø Daylighting System                                        

•  Sunlight capture System  
•  Optical Reflective System
•  High-Performance Light Diffuser

Ø Lighting Automation Control  

•  Daylight Sensor
•  Lighting controller
•  Central control panel & EMS

Ø Electrical lighting

• High bay LED Lamps

Working

During the day, the double glazed Light Collector receives sunlight over a large surface area and distributes light into the optical reflective system placed below it. This is built from highly reflective surfaces assembled in an Aluminium fixing system which guides the intercepted light to diffuser further below.

The high-performance diffuser then spreads the daylight evenly without any glare or heat into the workspace. The system’s daylight sensor continuously monitors the ambient sunlight. The electric lamps are divided into three groups each representing a step for switching on/off. If the daylight on task level is less than desired light intensity, called the setpoint, the controller switches on the required number of steps in electric lighting to achieve the setpoint, compensating the reduction of daylight. This compensation is achieved in three steps from electric lighting completely off to fully on mode or vice versa. With the option of advanced LED luminaire, this compensation is more efficient and smooth.

Thus, the necessary light for any given space always remains constant, despite changes in weather conditions or transition from day tonight.
A single control panel connected to many systems helps in monitoring the energy consumption and savings of lighting systems. Also, this has the ability to manually override systems, monitoring failures, and data input.