著者
青木 慎一 倉光 修 阪口 敏彦 石井 実
出版者
The Illuminating Engineering Institute of Japan
雑誌
照明学会 全国大会講演論文集
巻号頁・発行日
pp.166, 2005 (Released:2007-07-01)

昆虫の誘虫性は松下電工カタログ照明設計資料 照C-31 p208に示されているものである。しかし、これらの方法では、同じ照度での誘虫性評価しか行えない。そこで、本報では実際の照明器具及び壁材等の昆虫の誘虫性を、定量評価する評価手法の研究を行ったので報告する。新しい誘虫性指数を検討し、実際の誘引実験で、検証を行った。その結果からも、今後、新誘虫性指数を用いることによって、昆虫の誘虫性を評価することが可能であると考えられる。
著者
Sanaz Bozorg John D. Bullough
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Science and Technology in Lighting (ISSN:24323225)
巻号頁・発行日
pp.IEIJ200000644, (Released:2021-10-15)
参考文献数
63
被引用文献数
3

Road lighting is best known to have the potential to improve night-time safety. The vast majority of research studies have shown that the installation of road lighting has favourable effects on the number and severity of road collisions. In addition, some evidence suggests that current road lighting practices are over-lighting the roadway. Therefore, the rapidly growing concerns about energy consumption and its related costs will force further changes in road lighting technology and practice. To date, there have been no studies that investigated the association between current knowledge and the road lighting guidelines. This article reviews and discusses CIE road lighting guidelines for motorised traffic. It then provides current knowledge in the area of lighting motorised roads leading to possibilities for intelligent lighting control. Finally, suggestions for considering dimming of road lighting based on recent developments in science and technology are provided. The three recommended approaches, static road lighting, semi-dynamic lighting levels, and dynamic lighting levels, could save energy without compromising traffic safety.
著者
本郷 一隆 宮内 真人 林 健太郎 興梠 政広 秋永 良典 芹川 聖一
出版者
The Illuminating Engineering Institute of Japan
雑誌
照明学会誌 (ISSN:00192341)
巻号頁・発行日
vol.99, no.11, pp.589-593, 2015-11-01 (Released:2016-02-01)
参考文献数
6

Blue LEDs are now mass-produced, and road traffic signal heads using LED systems are being used. LED signal heads have advantages such as energy savings and a long life. However, newly proposed LED signal heads have difficulty reducing problems such as the washout phenomenon. In this paper, we have proposed reducing the washout phenomenon of LED signal heads by using LED element 192 and the low-reflection black plate called a“phantom board”on a blank area between the elements. On the basis of light intensity distribution and luminance uniformity measurements, it was confirmed that the LED signal head we proposed satisfies the conditions described in the traffic signal lighting specifications of the National Police Agency. The visibility of the signal head was improved, as apparent from the before and after improvement pictures taken in the morning and the evening when the sun was at a low altitude and as a result of the phantom ratio.
著者
原田 保之助 高間 繁
出版者
The Illuminating Engineering Institute of Japan
雑誌
照明学会雑誌 (ISSN:00192341)
巻号頁・発行日
vol.12, no.3, pp.168-177, 1928

本文は最近開通せる本邦最初の地下鐵道の照明に就き調査せる結果である。大膿の照度は床上80糎の照面に於て, 停車場及プラットホーム25乃至50米燭, 電車丙37米燭であつた。
著者
Tomohiro Yako Yoshiki Kuse Shinsuke Nakamura Masamitsu Shimazawa Takashi Motomura Hideaki Hara
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Science and Technology in Lighting (ISSN:24323225)
巻号頁・発行日
vol.42, pp.29-32, 2019-03-27 (Released:2019-04-01)
参考文献数
12
被引用文献数
1

Blue light emitting diode (LED) light is being used various devices for recent decades. Blue LED light has the 450–500 nm wavelengths, and high photon energy compared with green or red LED light. It is known that the exposure to blue LED light causes retinal photoreceptor cells damage. It is unknown whether the blue LED light cut particle containing lens has a protective effect against blue LED light-induced cell damage although the absorbance by colored lens shows a protective effect. Thus, the purpose of this study was to reveal that the protective effect of blue LED light cutting particle containing lens against photoreceptor and corneal epithelial cell damage induced by blue LED light exposure. We irradiated blue LED light to the mouse photoreceptor cells and human cornea epithelial cells with or without lens. The lens containing about one third blue LED light cutting particle (TECHPOLYMER) decreased production of reactive oxygen species and improved cell death rate and cell viability rate. These findings show that TECHPOLYMER containing lens may protect photoreceptor and cornea cells by reducing of reactive oxygen species.
著者
Tomohiro Jishi Kazuhiro Fujiwara Kyohei Nishino Akira Yano
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Light & Visual Environment (ISSN:03878805)
巻号頁・発行日
vol.36, no.3, pp.88-93, 2012-12-01 (Released:2013-03-04)
参考文献数
9
被引用文献数
3 11

The CO2 uptake rate (CUR) of the aerial part of cos lettuce (Lactuca sativa) was measured in pulsed and continuous light at an average photosynthetic (wavelength range: 400–700 nm) photon flux density (PPFD) of 100 μmol m-2 s-1 from white light-emitting diodes (LEDs). Three duty ratios of 25, 50, and 75%, combined variously with eight frequencies of 0.1, 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, and 12.8 kHz were used for pulsed light irradiation. The CURs were significantly lower at a duty ratio of 50% for frequencies of 0.1–0.8 kHz and at a duty ratio of 25% for all frequencies than those in continuous light although the average PPFD was unchanged. These results indicate that pulsed light at lower duty ratios, combined with lower frequencies, makes CUR of cos lettuce lower than that attained in continuous light. We infer, based on a PPFD-CUR curve obtained with cos lettuce plant used in the experiment, that when greater PPFD is provided, pulsed light at lower duty ratios with lower frequencies is less advantageous than continuous light for photosynthesis.
著者
Joshua J Gooley
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Science and Technology in Lighting (ISSN:24323225)
巻号頁・発行日
vol.41, pp.69-76, 2018-03-20 (Released:2018-03-26)
参考文献数
46
被引用文献数
4

Light is the most important environmental signal for synchronizing human circadian rhythms. The circadian system is normally synchronized with the solar day, ensuring that the sleep–wake cycle and endocrine rhythms are timed appropriately. However, exposure to electrical lighting can also reset circadian rhythms. In this short review, we discuss properties of light stimuli that are important for resetting the human circadian system. The direction and magnitude of light resetting are circadian phase-dependent, with exposure to light in the early biological night resulting in a phase-delay shift of circadian rhythms, and exposure to light in the late biological night and early morning resulting in a phase-advance shift. Circadian resetting responses can be enhanced by increasing the irradiance or duration of the light stimulus, or by using short-wavelength blue light to activate intrinsically photosensitive retinal ganglion cells that express the photopigment melanopsin. This knowledge can potentially be applied to improve light therapy for circadian rhythm sleep disorders, and to help reset circadian rhythms in individuals exposed to shift work or jet lag.
著者
Yoshinobu NAYATANI Hiroaki SOBAGAKI Kenjiro HASHIMOTO
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Light & Visual Environment (ISSN:03878805)
巻号頁・発行日
vol.17, no.2, pp.2_16-2_24, 1993 (Released:2011-02-25)
参考文献数
21
被引用文献数
6 7

Using the nonlinear color-appearance model, predicted are the four kinds of color-perception phenomena, which are the Go function studied by Evans, Munsell Values for different hues, purity discrimination, and the Helmholtz-Kohlrausch effect. The analysis confirmed that all the four phenomena are caused by the same common factor, the chromatic strength of spectral color stimulus reported by Evans in 1967.
著者
Naoya HARA Ichiro NAMBA Tarow NOGUCHI
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Light & Visual Environment (ISSN:03878805)
巻号頁・発行日
vol.27, no.3, pp.165-171, 2003 (Released:2004-01-23)
参考文献数
7
被引用文献数
8 10

The purpose of this study is to obtain data based on the readability of chromatic documents for use in visual environment design. That data would seem to be the same as the existing data based on the readability of achromatic documents. Experiments are undertaken in order to clarify the influence of color on readability. The results show that the same CIELAB color difference does not have the same influence on readability. In addition, it is thought that the equivalent luminance contrast is invariable irrespective of the size of a letter and is instead determined by the combination of the colors of the letters and the background. It is suggested that the readability of chromatic documents can be estimated by using the equivalent luminance contrast and the existing relationship between the visual factors and readability of achromatic documents.
著者
Kanji KATORI Masahiro FUWA
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Light & Visual Environment (ISSN:03878805)
巻号頁・発行日
vol.9, no.1, pp.1_22-1_32, 1985 (Released:2011-05-20)
参考文献数
12
被引用文献数
3 3

With a view to developing a new photometric system which will give a better agreement with the visual impression of the light, the effects of both the visual field sizes and the criteria for measurement of spectral luminous efficiency functions on the shapes of the functions were examined in the case of 2° and 10° fields, by applying two different methods, flicker photometry and direct heterochromatic brightness matching, using the same white reference. A 2° field function by flicker photometry was very similar to Judd’s modified V(λ) function while a 2° field function by direct heterochromatic brightness matching showed hilly humps on both sides of 570 nm. A 10° field function by flicker photometry showed no significant differences from both the CIE y10(λ) and the ETL y10(λ) functions derived from the color matching functions. These findings suggest that the CIE y10(λ) function should be used as a standard photometric observer in the large visual field. A 10° field function by direct heterochromatic brightness matching showed the largest values among the four relative spectral luminous efficiency functions over the whole range of visible wavelengths. The relative spectral luminous efficiency data obtained by heterochromatic brightness matching for the 2° and 10° fields here will provide data useful for development of a new photometric system where a great importance is to be attached to a correspondence between sensation of brightness and photometric quantity.
著者
John D. BULLOUGH Ramesh RAGHAVAN Richard M. PYSAR Yukio AKASHI
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Light & Visual Environment (ISSN:03878805)
巻号頁・発行日
vol.31, no.1, pp.19-24, 2007 (Released:2007-06-08)
参考文献数
18
被引用文献数
1

Temporal characteristics of fluorescent lighting systems during starting might affect their acceptance in commercial and residential lighting. The immediate, full onset of light is usually experienced when switching on incandescent lamp systems. For certain systems using fluorescent lamps, delayed onset or initially low light levels might be experienced. Such characteristics could make them unwelcome additions to commercial and residential settings. The results of a study to investigate subjective and behavioral responses to lighting systems having different temporal characteristics upon start-up are presented.
著者
Ken-ichiro Suehara Takaharu Kameoka Atsushi Hashimoto
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Science and Technology in Lighting (ISSN:24323225)
巻号頁・発行日
vol.41, pp.12-21, 2018-03-20 (Released:2018-03-26)
参考文献数
33
被引用文献数
3

To construct a simple optical sensor for measurement of the sugar content in an aqueous solution, a bent optical fiber was used as the sensor. The attenuation ratio, i.e., the differences in the light intensity through the bent optical fiber when the sensitive part (bent part) was soaked in a reference material and sample solution, was closely related of the solute content in the samples. However, slightly difference in the light intensity were observed in the practical application because the sugar content in foods and other bio-systems was much lower than that in the tested samples. Therefore, we constructed a sensor system using a light emitting diode (LED), photo diode (PD) and simple electronic circuit as a differential amplifier. As a result, measurement of the sugar content ranging from 0 to 30 g/dm3 was successful and excellent agreement between the FT-IR method as the conventional method and the sensor method using an operational amplifier (OP-amp) was observed. In addition, the time courses of the sugar content and the uptake rate of plant cells were able to be calculated during the cultivation process. The process monitoring for the fermentation process management will be possible by using this sensor. These results suggested that the developed sensor using a bent optical fiber is applicable as a simple and disposable optical sensor.
著者
阿佐 宏一郎 小田 浩一
出版者
The Illuminating Engineering Institute of Japan
雑誌
照明学会誌 (ISSN:00192341)
巻号頁・発行日
vol.94, no.5, pp.283-288, 2010-05-01
被引用文献数
1

The estimation of optimal print size for reading is often essential in clinical treatment and/or universal design; however, it is not known how to calculate the proper letter size for reading with maximum efficiency. Psychophysics studies have revealed psychometric functions of reading that exhibit a hill-like shape with a plateau of maximum speed and a downfall beyond Critical Print Size (CPS). To control the magnification rate of visual aids for patients with visual impairments, CPS that can indicate the boundary of maximum efficiency is now becoming a noteworthy index to determine optimal letter size. In addition to reading, word searching is also an important task for our living. However, the CPS of word search tasks has not been examined yet. We estimated the CPS of word search from the results of two experiments focused on searching for words in Chinese characters and Japanese alphabet (Katakana: square forms) in Japanese. The functions of the searching tasks showed a hill-like shape almost identical to the reading tasks but with elevated speed, and the CPS were stable around 0 logMAR in both the reading and the searching tasks. Hence, CPS is unsusceptible to tasks and can function as a robust marker for the smallest print size with maximum speed. This finding indicates that CPS is the threshold of proficiency (maximum/reduced) beyond the threshold of vision (visible/invisible). CPS can be a meaningful index to achieve the appropriate control of print size and subsequently help people with visual problems.
著者
西澤 勇志智
出版者
The Illuminating Engineering Institute of Japan
雑誌
照明学会雑誌 (ISSN:00192341)
巻号頁・発行日
vol.13, no.6, pp.303-315, 1929

本篇は照明學會東京支部の講演にして花火の發達由來を述べ, 績いて花火の化學的組成並に其諸種の應用殊に近代最新武器としての利用に就て読きたるものなり。