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Lighting is one of the major energy consuming sector in any type of buildings. Lighting design plays a major role in Green Building concepts to provide optimized lighting levels and better energy efficiency. This paper is based on the lighting design of a food processing industry adhering to Food and Drug administration Norms so as to achieve Green Building certification. The study is conducted on...
In this paper a new approach for static state estimation of linear DC circuits using iteratively weighted least squares algorithm is discussed. Three cases of erroneous meter readings while measuring currents and voltage in a simple voltage divider circuit are considered for illustration. Large size of electrical networks limits the number measurements available for state estimation. With limited...
Adoption of LED lighting in large scale has opened a debate on how to evaluate performance of commercially available LED lighting products. In this paper a review of existing photometric flicker metrics and measurement methods for LED lighting products is discussed. There is an urgent need to characterize potentially visible temporal light artifacts, or popularly known as flicker from light sources...
Proper functioning of any Real Time System depends on both functional and non-functional properties of the system. Validation of functional aspect is usually done after the deployment of the system in the functional environment. But the validation of nonfunctional properties at later stage could lead to the system changes which could be costly at later stage. Early stage evaluation of the nonfunctional...
LED lighting technology is advancing at fast pace, LED lighting products in the market show a wide range of performance characteristics. This work explains the need for trustworthy, fair product performance information to promote the market for LED lighting products. In this work more than 120 LED down lights were tested using industry-approved test procedures and summary of the results is presented...
Spectrometers measure optical power as a function of wavelength. Optical spectrum analysis is very important part of optical spectroscopy applications. A low cost DIY spectrometer can be created using DVD-R as diffraction grating and camera as the sensor. Pre-calibration of the DIY spectrometer using a mercury vapor based reference light source is essential. The work discussed in this paper is a proposed...
As the operating temperature of a LED lighting product increases, quite a few performance parameters experience a short-term and recoverable shift. With increasing operating temperature of a LED lighting product, forward voltage reduces, luminous flux reduces, and the color characteristics change from the desired characteristics. Furthermore, maximum junction temperature of the LEDs in the lighting...
Recent advancement in solid state technology has made LED lighting energy-efficient and today it is one of the rapidly-developing lighting technologies. Design of LED lighting luminaires is still repeatedly governed by misinterpretations and inappropriate use of the related solid state lighting technology. Heat is generated as byproduct of the light generation process at the LED junction; this heat...
Operating junction temperature of LEDs is linked directly to lifetime, long term reliability and failure modes of LED luminaires. It is important to measure the operating junction temperature to assess the health of a LED luminaire / solid state lighting product. Measuring the junction temperature of LEDs is a difficult task as in modern LED luminaires the tiny LEDs are surrounded by optical system...
Solid state lighting, in particular are replacing most of the general lighting applications. Most of the present day solid state lighting systems are designed without any user interface and cannot adjust the brightness level efficiently. Many of the LED lighting system developed has analog circuitry developed to control the PWM output but with the disadvantage of huge and complex circuit. In this...
The lifetime of LED luminaires, made of high power LED arrays, operating under hostile conditions is determined by their thermal design, operating junction temperature and thermal transients managed by the thermal system. Thermal transient characterization is a noninvasive study of the thermal resistance characteristics or thermal design of the LED luminaire. This procedure can identify anomalies...
LED luminaires are extensively used in a variety of applications. The LEDs are driven by from fraction of an ampere to nearly one ampere. LED luminaires are required to operate at high temperatures, depending on the application. High-power LED luminaires generate too much heat. If the heat generated is not dissipated away from the LED device it will affect the useful operating life and color characteristics...
Good quality lighting promotes better learning. Good quality classroom illumination improves mood, behavior and concentration of students. Lighting contributes to around 20%–30% of electricity consumption in an academic institute. It is important to cut energy costs as availability of energy is a matter of concern. There should be greater effort to optimize the usage of energy in lighting installations...
Commercial and Industrial lighting constitutes a sizeable portion of energy consumed. It is important to find ways cost-effective ways of utilizing energy consumed as energy prices soar. This project reports work based on video based human occupancy sensing and controlling the lighting level accordingly. Work involves development of human occupancy sensing system in MATLAB and hardware setup to control...
This paper analyses a project conducted to study the performance of LED luminaires in a road lighting application. Economic performance of the LED lighting as compared to HPSV lighting was also analyzed. This paper analyses the option of replacing HPSV lighting with LED lighting. Road lighting forms an important part of infrastructure in any modern city. Government agencies therefore must take up...
This work presents our effort to predict the long term reliability of LED arrays using the application of accelerated life testing principles. Assessment of long term reliability and performance of LED arrays is a testing exercise but it is also vital for successful acceptance of Solid State Lighting (SSL) systems. The objective of this work is to analyze IESNA LM-80 test data obtained from the LED...
Incredible long-life makes LED lighting systems a good long-term investment The higher capital cost is justified as there is long-term energy and maintenance cost savings. Operational requirements and materials used in manufacturing a of LEDs make then-failures distinctive compared to other microelectronics devices. Significant effort has gone into understanding of the failure modes and mechanisms...
Designing a building with maximum utilization of daylight and use of energy efficient luminaires will reduce the cost of energy use. In the present study, by means of computer simulations using RELUX software, the interaction between natural and artificial light and the related illumination conditions expected in a commercial office building in Mumbai, India have been simulated and analyzed. In this...
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