Endo Lighting Corporation

Japan

Endo Lighting Corporation

Japan

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Uetsuki T.,Tsuyama National College of Technology | Ueda M.,Endo Lighting Corporation | Nimata S.,Plasma Technology Co. | Salmi M.,Panasonic | Kakehashi H.,Panasonic
Journal of Light and Visual Environment | Year: 2010

To increase the efficiency and lumen output of inductively coupled electrode-less lamps, numerous studies have attempted to reduce their operating frequency. This is because if the operating frequency is reduced, a wider range of semiconductor devices can be used that enable higher lumen outputs to be obtained from these lamps. The switching loss can be reduced thus increasing the efficiency. We investigated the relationship between the operating frequency of a 50-W electrode-less lamp and its characteristics. Operating frequencies of 13.56 MHz and 135 kHz were used. The characteristics that we investigated are its starting characteristics, the plasma characteristics (such as the temperature and density of the electrons), and its efficiency in producing UV radiation. The results show that the efficiency in producing UV radiation at 135 kHz is 7% lower than that at 13.56 MHz, and that plasmas generated at operating frequencies of 135 kHz and 13.56 MHz had different electron-density and electron-temperature distributions because of the different power input positions.


Ko B.,University of Tokyo | Koga T.,University of Tokyo | Lu B.,NIKKEN SEKKEI | Hirate K.,University of Tokyo | And 2 more authors.
Journal of the Illuminating Engineering Institute of Japan (Shomei Gakkai Shi) | Year: 2013

We assume that when people look around an entire space, the total impression is created through the accumulation of visual information in every direction. We define "brightness of a space" and examine the impact factors and quantification. The results of previous studies suggest that it is reasonable to use average luminance and luminance contrast. However, when the entire space is defined as "brightness of a space", luminance contrast cannot be applied. For this reason, we consider the physical quantity that shows the variation of the brightness in our evaluation experiment on Brightness. It is possible to propose using a prediction equation of " brightness of a space" using the standard deviation of the logarithm of the luminance values and average luminance.


Kozaki M.,University of Tokyo | Koga T.,University of Tokyo | Hirate K.,University of Tokyo | Wakabayashi N.,Living Environment Studio Act | And 2 more authors.
AIJ Journal of Technology and Design | Year: 2014

This study proposes a lighting method that reduces energy usage and improves evaluation of lighting environment. Method focused on planning the zone, changing lighting equipment and considering the surface of space. This method was applied to a renovation of a commercial building with multiple tasks. Comparing before and after the renovation, it proved successful in reducing energy usage, decreasing luminous flux, improving evaluation of the lighting environment, and physical quantities of the environment.


Komatsu Y.,Nagoya Institute of Technology | Egoshi M.,Endo Lighting Corporation | Ikeda T.,Daiwa House Industry Co. | Tamada T.,Nagoya Institute of Technology
Journal of Environmental Engineering | Year: 2011

In this paper, the effects of different kinds of lights on dark spots of residential streets at nighttime are studied. The measurements of illuminance on road surface and the subjective evaluation of the dark spots are carried out to investigate the distribution of dark spots. Based on the result, the dark spots can be classified into two types. One is seen over intense lights, e.g., the light from vending machine or shop. The recognizable distance of this type is long. The other is seen in low luminance spaces. According to the result of the examination of pedestrian paths, it is obvious that people avoid these dark spots. This might mean that people feel uncomfortable toward these dark spots. In conclusion, in order to decrease the number of dark spots, it is desirable to avoid that illuminance on road surface fluctuate rapidly.


Patent
Endo Lighting Corporation | Date: 2015-02-04

A lens plate and an illumination lamp which are not affected by heat from a light source even if the lens plate is small. The lens plate for an illumination lamp has the lens part covering the light source, and the lens part is formed in such a way that a concentric lens pattern is separately formed on an outer central part and an inner peripheral part so as not to be overlapping.


Patent
Endo Lighting Corporation | Date: 2012-07-19

A lens plate and an illumination lamp which are not affected by heat from a light source even if the lens plate is small. The lens plate for an illumination lamp has the lens part covering the light source, and the lens part is formed in such a way that a concentric lens pattern is separately formed on an outer central part and an inner peripheral part so as not to be overlapped.


Trademark
ENDO Lighting Corporation | Date: 2010-02-15

Electric lamps using light-emitting diodes; lighting apparatus using light-emitting diodes, namely, LED lighting fixtures for indoor and outdoor lighting applications, chandeliers, spotlights, downlights, buried lights, pendant lights and indirect lighting fixtures.


Trademark
ENDO Lighting Corporation | Date: 2012-05-14

Electric lamps; lighting apparatus using light-emitting diodes, namely, LED lighting fixtures; lighting apparatus, namely, lighting installations, all of the aforementioned goods excluding lighting apparatus used for medical and surgical apparatus and instruments and excluding lighting apparatus incorporated into medical instruments.

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