Light Sources and Lighting Circuits

Abstract

ＡＢＳＴＲＡＣＴAccording to machinery statistics of the Ministry of Economy, Trade and Industry, the quantity of electric lamps produced in Japan in 2010 was 797,000,000 (129.5% compared to the previous year). Of these, 70,000,000 were general lamps (95.5% compared to the previous year) and 35,000,000 were halogen lamps (109.7% compared to the previous year). The number of fluorescent lamps produced was 545,000,000 (86.9% compared to the previous year), and the number of general fluorescent lamps excluding backlights was 251,000,000 (104.5% compared to the previous year). Furthermore, the number of HID lamps produced was 9,700,000 (127.3% compared to the previous year). On the other hand, when looking at sales compared to the previous year, the results for general lighting electric lamps, halogen lamps, general fluorescent lamps, backlights, and HID lamps were 87.3%, 105.1%, 98.1%, 64.7%, and 110.7%, respectively. Moreover, the sales of bulb-type fluorescent lamps included in general fluorescent lamps were 83.9% when compared to the previous year. Adding up these numbers to discuss trends is not an easy task, but we can glean two conflicting factors from this data: a long-term reduction via transition to LED light sources, and a short-term recovery from the significant reduction caused by the economic downturn of 2009. Only backlights show a significant reduction of more than 30% for 2 years in succession, due in large part to a switch to LED lighting. Our main exhibitions included "LED Next Stage

Simulation and comparison of the illuminance, uniformity, and efficiency of different forms of lighting used in basketball court illumination

“…In recent years, metal-halide lamps have often been used for nonconventional lighting purposes, such as the illumination of large indoor areas; however, metalhalide lamps operate under high pressure and temperature, and require special fixtures to operate safely [2][3][4]. Since the lamp is small when compared to a fluorescent or incandescent bulb of the same light level, relatively small reflective luminaires can be used to direct the light for different applications, such as flood lighting, outdoor lighting, warehouse lighting, industrial lighting, or lighting in indoor gyms/basketball courts [5]. In addition, powerful new legislation now demands consideration of the environmental impact a product has over its entire life cycle, from production to disposal.…”