Generalization of the unified glare rating method: a proposal and laboratory test

2001 ◽  
Vol 33 (4) ◽  
pp. 243-257 ◽  
Author(s):  
P Sendrup
Keyword(s):  
Visual Field ◽  
Laboratory Test ◽  
Modified Method ◽  
Lighting Conditions ◽  
Interior Lighting ◽  
Rating Method ◽  
Lighting Systems ◽  
Basic Hypothesis

The applicability of the unified glare rating (UGR) method is limited to interior lighting systems, with small and well-defined glare sources. The basic hypothesis of the method is to divide the visual field into a background and a number of glare sources. The distinction between background and glare sources prevents the method from being applied to large glare sources and is a disadvantage for integral measurement. This paper presents a proposal for modification of the UGR method that eliminates the need for distinction between background and glare source. The modification has little consequence for normal interior lighting conditions as shown for two examples included in CIE report 117. Two glare investigations showed however that the modified method cannot readily be applied to the general case.

Research into the Effect of Photometric Flicker Event on the Perception of Office Workers

2019 ◽  
pp. 22-27
Author(s):  
Cenk Yavuz ◽  
Ceyda Aksoy Tırmıkç ◽  
Burcu Çarklı Yavuz
Keyword(s):  
Experimental Work ◽  
Psychological Problems ◽  
Office Workers ◽  
Questionnaire Study ◽  
Fast Growing ◽  
Lighting Conditions ◽  
Lighting Systems ◽  
Enormous Number

Today the number of office workers has reached to an enormous number due to the fast-growing technology. Most of these office workers spend long hours in enclosed spaces with little/no daylight penetration. The lack of daylight causes physiological and psychological problems with the workers. At this point lighting systems become prominent as the source and the solution of the problem. Photometric flicker event which arises in the lighting systems can sometimes become visible and brings a lot of issues with it. In this paper, an experimental work has been done to investigate the effect of flicker. For this purpose, the flicker values of 3 different experiment rooms for different lighting conditions and scenarios have been measured and a questionnaire study has been carried out in the experiment rooms with 30 participants. In conclusion, the effect of the flicker event on the volunteers have been classified and some methods have been proposed not to experience flicker effects.

scholarly journals Aberrant Lighting Causes Anxiety-like Behavior in Mice but Curcumin Ameliorates the Symptoms

Animals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2590
Author(s):  
Dhondup Namgyal ◽  
Kumari Chandan ◽  
Sher Ali ◽  
Ajaz Ahmad ◽  
Maha J. Hashim ◽  
...  
Keyword(s):  
Body Weight ◽  
Research Field ◽  
The Body ◽  
Laboratory Animals ◽  
Artificial Lighting ◽  
Lighting Conditions ◽  
Daily Food ◽  
Significant Difference ◽  
Negative Effect ◽  
Lighting Systems

In the modern research field, laboratory animals are constantly kept under artificial lighting conditions. However, recent studies have shown the effect of artificial light on animal behavior and metabolism. In the present study on mice, following three weeks of housing in dim light at night (dLAN; 5lux) and complete darkness (DD; 0lux), we monitored the effect on body weight, daily food intake, anxiety-like behavior by employing the open field test, and expression of the period (PER1) gene. We also studied the effect of oral administration of different concentrations of curcumin (50, 100, and 150 mg/kg) for three weeks in the same mice and monitored these parameters. The exposure to dLAN had significantly increased the anxiety-like behavior and body weight possibly through the altered metabolism in mice, whereas exposure to DD caused increased anxiety but no significant difference in weight gain. Moreover, the expression of the PER1 gene involved in sleep was also found to be decreased in the aberrant light conditions (dLAN and DD). Although the treatment of curcumin had no effect on body weight, it ameliorated the anxiety-like behavior possibly by modulating the expression of the PER1 gene. Thus, alteration in the light/dark cycle had a negative effect on laboratory animals on the body weight and emotions of animals. The present study identifies the risk factors associated with artificial lighting systems on the behavior of laboratory animals and the ameliorative effects of curcumin, with a focus on anxiety-like behavior.

Perception of Simple and Complex Visual Stimuli: Decision Strategies and Hemispheric Differences in Same—Different Judgments

Perception ◽  
1995 ◽  
Vol 24 (7) ◽  
pp. 787-809 ◽  
Author(s):  
R John Irwin ◽  
Margaret A Francis
Keyword(s):  
Visual Field ◽  
Receiver Operating Characteristic ◽  
Operating Characteristic ◽  
Visual Stimuli ◽  
Optimal Decision ◽  
Hemispheric Differences ◽  
Decision Strategy ◽  
Decision Strategies ◽  
Visual Patterns ◽  
Rating Method

The accuracy with which observers could judge whether two visual stimuli were the same or different was measured with the rating method of detection theory. For judgments of whether two pictures referred to natural or manufactured things, the shape of the obtained receiver operating characteristic (ROC) was consistent with the observers adopting an optimal decision strategy. A similar result was found for judgments of complex but meaningless visual patterns. For judgments of whether two colours that differed along a simple sensory dimension were the same or different, however, the resulting ROC was consistent with the observers adopting a suboptimal differencing strategy. The accuracy of the judgments did not depend on the visual field to which the stimuli were presented.

Simulation of New Automobile Lighting Systems for a Nightdrive Application

2003 ◽  
Author(s):  
Jan Berssenbru¨gge ◽  
Carsten Matysczok ◽  
Klaus Po¨hland ◽  
Thomas Weber ◽  
Peter Ebbesmeyer
Keyword(s):  
Real Time ◽  
Development Process ◽  
Test Drive ◽  
Virtual Test ◽  
Geometry Model ◽  
Lighting Conditions ◽  
Evaluation Test ◽  
Illumination Method ◽  
Lighting Systems ◽  
Polygon Meshes

For the development of new automobile lighting systems, special raytracing methods are needed to create physically correct simulations of the illumination properties. For further evaluation, test drives with physical prototypes are still necessary. But changing weather and lighting conditions make the test drive results not fully comparable. Therefore, a high number of test drives have to be performed. This leads to a costintensive and time-consuming development process. Virtual test drives at night combined with a realistic simulation of a lighting system’s illumination characteristics can minimize the number of real nightdrives and allow reproducible testing conditions as well as comparable results. A close-to-reality simulation poses high demands on real-time methods for calculating and displaying illumination data in a virtual scene. Furthermore, the geometry model of the scenery which is to be illuminated needs to be adapted to fulfill these demands. This paper introduces a real-time illumination method for use in a nightdrive simulation which illuminates scenery models using coarse polygon meshes.

Lighting System Preferences for VDT Stands with LCD Screens

2000 ◽  
Vol 44 (21) ◽  
pp. 3-499-3-499
Author(s):  
Agnieszka Wolska
Keyword(s):  
Visual Performance ◽  
Lighting System ◽  
Dark Light ◽  
Lighting Conditions ◽  
Different Types ◽  
Lighting Systems ◽  
New Generation

There are different types of lighting systems suitable for VDT work, which create different interior appearances with respect to the main lighting parameters at the recommended levels at the same time. A new generation of VDT screens, flat panels, which produce the image on the screen in a completely different way, may demand different lighting conditions than CRT screens. The aim of the study was to model different lighting systems for VDT work with LCD screens and their influence on the users' preferences and visual performance. The results of the study showed that the most preferred lighting system for VDT work with LCD screens is direct lighting realized by “dark-light” luminaires.

scholarly journals Video Analysis of Pedestrian Movement (VAPM) under Different Lighting Conditions—Method Exploration

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4141
Author(s):  
Maria Johansson ◽  
Aliaksei Laureshyn ◽  
Mikael Nilsson
Keyword(s):  
Video Analysis ◽  
Smart City ◽  
Large Scale ◽  
Outdoor Environment ◽  
Energy Usage ◽  
Pedestrian Movement ◽  
Lighting Conditions ◽  
Methodological Triangulation ◽  
Lighting Systems ◽  
New City

When daylight hours are limited, pedestrians are dependent on appropriate outdoor lighting. Although new city lighting applications must consider both energy usage and pedestrian responses, current methods used to capture pedestrian walking behaviour during dark conditions in real settings are limited. This study reports on the development and evaluation of a video-based method that analyses pedestrians’ microscopic movements (VAPM—video analysis of pedestrian movements), including placement and speed, in an artificially lit outdoor environment. In a field study utilising between-subjects design, 62 pedestrians walked along the same path under two different lighting applications. VAPM accurately discriminated pedestrians’ microscopic movements in the two lighting applications. By incorporating methodological triangulation, VAPM successfully complemented observer-based assessments of pedestrians’ perceptions and evaluations of the two lighting applications. It is suggested that in evaluations of pedestrian responses to city lighting applications, observer-based assessments could be successfully combined with an analysis of actual pedestrian movement while walking in the lit environment. However, prior to employing a large-scale application of VAPM, the methodology needs to be further adapted for use with drones and integration into smart city lighting systems.

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