Abstract The influence of the temperature two white LEDs, a good brand and one unknown brand, on their characteristic curves light properties was experimentally evaluated in range from 10 °C to 95 °C. measurements show that luminous efficacy decreases with increasing temperature, specially LED brand. In addition, small redshift could be observed blue peak respective spectra, as well changes cor...

Using of natural lighting has come into prominence in constructed buildings, especially in last ten years, under scope of energy efficiency. Natural lighting methods are one of the methods that aim to take advantage of day light in maximum level and decrease using of artificial lighting. Increasing of day light amount in buildings by using suitable methods will give optimum result in terms of c...

Increasing user comfort and reducing operation costs have always been primary objectives of lighting control strategies in a building. This paper proposes an architecture of the lighting control system for a daylit office. The system consists of the lighting controller, A/D & D/A converter, dimmable LED lights, and the lighting management software. Verification tests are conducted using the pro...

Due to the attenuation of light in water, deep-sea optical imaging system needs an active lighting provide source. However, because nonlinearity spatial dimension and spectral dimension, differs from terrestrial lighting. In order quantitatively analyze design system, we proposed a precise field simulation model method based on transfer function. Firstly, with analysis lighting-imaging process,...

The intent of this paper is to initiate a discussion within the community interested in commercial refrigerators, on the possible use of LED lighting in commercial refrigerated and freezer display cases. The fluorescent lighting presently used in commercial refrigerators is inefficient in the application and also it provides poor lighting for merchandising. LED is a solid-state light source tha...

We are doing research and development of an intelligent lighting system. In the intelligent lighting system, the algorithm which controls lighting fixtures is important. In this research, we examine how to grasp the position relation between the lighting and the illuminance sensors with sufficient accuracy, and we propose a lighting control algorithm which estimates accurate position relation b...

LED lighting technology has been advancing quite rapidly and it used in sports facilities. characteristics such as a small light emitting part high directionality, which may cause glare. JIS recommendation for does not provide the recommended value glare gymnasiums. In Part 1 of this paper, measurements illuminance luminance distribution were carried out eleven gymnasiums (six with five HID lig...

Accurate assessment of people's preferences for different outdoor lighting applications is increasingly considered important in the development of new urban environments. Here a new method of random environmental walking is proposed to complement current methods of assessing urban lighting applications, such as self-report questionnaires. The procedure involves participants repeatedly walking b...