LED Lighting Technologies Contributing to Global Warming Prevention
Toward Realization of Energy-Saving LED Lighting
Trends in LED Lighting and Toshiba's Approach
BESSHO Makoto / SHIMIZU Keiichi
Light-emitting diode (LED) luminaries are regarded as the fourth generation of light sources following incandescent lamps as the first generation, fluorescent lamps as the second generation, and high-intensity discharged (HID) lamps as third generation, due to their excellent characteristics in comparison with conventional light sources including high efficiency, long lifetime, compactness, light weight, no mercury content, and very small infrared and ultraviolet radiation. With the progress of LED lighting technologies, LED lighting is expected to further expand to a wide range of applications from sign and display devices with only small luminous flux, to downlighting, security lighting, and base lighting, and also to general indoor and outdoor lighting applications that require more luminous flux such as retail stores, business facilities, and homes.
Toshiba Lighting & Technology Corporation has been developing advanced LED products and technologies, and promoting the international standardization of LED lighting to reduce the burden on the environment.
High-Efficacy LED Lamps and Thin LED Unit to Replace Incandescent Lamps
OSAWA Shigeru / IZUMI Masahiro / SAKAMOTO Shizuka
Light-emitting diode (LED) lamps have continued to replace conventional incandescent lamps and have disseminated into a broad range of facilities and residences due to the increased improvement of cost performance compared with incandescent lamps. However, the brightness of LED lamps is not yet comparable with that of 60 W incandescent lamps.
Toshiba Lighting & Technology Corporation has developed the E-CORETM series LED lamps featuring the industry's best total luminous flux of 810 lm and a high luminous efficacy of 93 lm/W by the use of chip-on-board (COB) assembly technology. We have also developed a thin LED unit as a next-generation light source containing a power supply with a GX53 type base to realize a nonconventional thin and compact downlight.
LED Luminaires for Enhancement of Energy Conservation and Cost Reduction
WATANABE Hiroaki / TODA Masahiro / SAITO Akiko
With the development of high-efficiency and high-luminosity light-emitting diodes (LEDs) in recent years, conventional luminaires for both indoor and outdoor lighting applications are being replaced by LED luminaires. LED luminaires that meet the specifications of conventional luminaires are therefore required.
For indoor lighting applications, Toshiba Lighting & Technology Corporation has developed a compact LED spotlight luminaire for retail stores as an alternative to conventional high-intensity discharge (HID) spotlight luminaires. We designed the LED spotlight using three-dimensional computer-aided design (3D-CAD) and a thermal analysis simulator to help dissipate the heat of the LED efficiently. We also employed a printed circuit board (PCB) made of iron with a high-thermal-conductivity insulating layer suitable for the ceramic package of the LED, to prevent solder cracks caused by differences in the thermal expansion coefficients of the materials. Energy conservation of about 45%, downsizing of about 40%, and cost reduction of about 35% have been achieved.
For outdoor lighting applications, we have developed an LED security streetlight luminaire that can be set at the same intervals as existing streetlight luminaires. This was achieved by both designing the reflector shape using an optical simulator to decrease glare, and realizing high horizontal illuminance. Energy conservation of about 71% and long lifetime more than 300% have been achieved.
LED Lighting Control Technologies for Energy Conservation
KAMATA Masahiko / TAKASAKA Keitaro / KATANO Chikako
Light-emitting diodes (LEDs), particularly white LEDs, are a focus of high expectations as a general lighting source, To meet the requirements for performance and functionality of LED lighting equipment, such as low power consumption, high efficiency, compactness, and so on, a buck-boost converter provides an effective power supply for controlling the current of the LEDs, and either amplitude modulation or pulse-width modulation are selected as appropriate for the dimming control.
Toshiba Lighting & Technology Corporation is also engaged in the development of LED lighting equipment utilizing natural energy sources, such as solar voltaic energy and wind power, together with batteries.
Approach for Realization of Comfortable Lighting Environment Using LED Luminaires
KOTANI Tomoko / HIGASHI Hirokuni
With the improvement in luminous efficiency of white light-emitting diodes (LEDs), the use of white LEDs as light sources for indoor and outdoor lighting has shown a considerable increase. However, the performance of white LEDs, including their luminance, area of luminous surface, spectral distribution, and so on, differs from that of existing light sources. Therefore, the mere replacement of existing light sources with white LEDs sometimes causes differences in such aspects as color appearance, health effects, and glare.
Toshiba Lighting & Technology Corporation has been engaged in research and development aimed at realizing a comfortable lighting environment using LED luminaires taking differences in the characteristics of LEDs, including color appearance, non-visual effects, glare, eyestrain, and so on, into consideration.
Potential of LED Lighting from Viewpoint of Lighting Design
AMARI Norikuni / TAKEUCHI Eiki
With the wide dissemination of light-emitting diode (LED) luminaires in recent years, the mere replacement of existing products and energy-saving planning is not sufficient to ensure customer satisfaction in lighting design.
Toshiba Lighting & Technology Corporation has been putting forward differentiated proposals to enhance the specifications of LED luminaires through the selection of products, lighting plans, and system design taking into consideration the visual environment, practical utility, and rendition as well as optimal use of the features of products. In order to contribute to the further advancement and diffusion of LED lighting, we have been engaged in research and development of LED lighting design to overcome many issues related to software and hardware performance including control of glare and increase in output power.