scholarly journals The RADIANCE lighting simulation and rendering system

1994 ◽  
Author(s):  
Gregory J. Ward
Keyword(s):  
Lighting Simulation

scholarly journals The Implementation of Visual Comfort Evaluation in the Evidence-Based Design Process Using Lighting Simulation

2021 ◽  
Vol 11 (11) ◽  
pp. 4982
Author(s):  
Anahita Davoodi ◽  
Peter Johansson ◽  
Myriam Aries
Keyword(s):  
Performance Metrics ◽  
Analysis Data ◽  
Evidence Based ◽  
Visual Comfort ◽  
Simulation Tools ◽  
Post Occupancy Evaluation ◽  
Lighting Simulation ◽  
Insight Into

Validation of the EBD-SIM (evidence-based design-simulation) framework, a conceptual framework developed to integrate the use of lighting simulation in the EBD process, suggested that EBD’s post-occupancy evaluation (POE) should be conducted more frequently. A follow-up field study was designed for subjective–objective results implementation in the EBD process using lighting simulation tools. In this real-time case study, the visual comfort of the occupants was evaluated. The visual comfort analysis data were collected via simulations and questionnaires for subjective visual comfort perceptions. The follow-up study, conducted in June, confirmed the results of the original study, conducted in October, but additionally found correlations with annual performance metrics. This study shows that, at least for the variables related to daylight, a POE needs to be conducted at different times of the year to obtain a more comprehensive insight into the users’ perception of the lit environment.

Simulation and analysis of the effects of room surface reflectance combinations on a proposed retrofit illumination system of an office

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Subarna Roy ◽  
Sudipta Majumder ◽  
Sourin Bhattacharya ◽  
Imran Hossain Sardar
Keyword(s):  
Likert Scale ◽  
Surface Reflectance ◽  
Survey Questionnaire ◽  
Content Type ◽  
Scale Type ◽  
Illumination System ◽  
Office Space ◽  
Strong Linear Correlation ◽  
Lighting Simulation ◽  
Strongly Agree

Purpose An indoor office space should not only provide adequate illuminance on horizontal planes but also cater to the physiological and psychological requirements of the occupants. This paper aims to describe a lighting simulation-based work conducted in Kolkata, India which modeled an indoor office to investigate the effects of variation in room surface reflectance combinations on user perception, mean room surface exitance (MRSE), average horizontal illuminance and overall uniformity of horizontal illuminance. Design/methodology/approach A fluorescent illumination system–based office space was modeled and retrofitted with tubular LED lamps in DIALux. Simulations were conducted for 16 different room surface reflectance combinations and a five-point Likert scale-type survey questionnaire was formulated to conduct a survey with 32 test subjects to assess the subjective preferability of each resultant light scene. Findings Simulation results demonstrate that the relationship between average horizontal illuminance and MRSE as well as between average horizontal illuminance and overall uniformity of horizontal illuminance, was statistically significant (p < 0.001). In the conducted survey, the resultant light scene arising out of the reflectance combination of wall:ceiling:floor = 60%:90%:20% was the most well-received one with 187 convinced agreements (“agree” and “strongly agree” responses). Originality/value This work found strong linear correlation between average horizontal illuminance and MRSE and between average horizontal illuminance and overall uniformity. A five-point Likert scale-type survey questionnaire with seven questions was formulated and validated with 32 test subjects (Cronbach’s alpha > 0.9295), which showed that the wall:ceiling:floor reflectance combination of 60%:90%:20% was the most favored choice.

Comparative Evaluation of Daylighting Simulation Programs

2016 ◽  
Vol 824 ◽  
pp. 732-739 ◽  
Author(s):  
Lenka Gábrová ◽  
Michaela Hlásková ◽  
František Vajkay
Keyword(s):  
Comparative Evaluation ◽  
Computer Programs ◽  
Test Cases ◽  
Technical Report ◽  
Daylighting Simulation ◽  
Lighting Simulation ◽  
Complex Cases

Daylighting simulation programs use different methods and algorithms for illuminance calculations in buildings. It is widely known that results of different lighting simulation programs does not have to be the same for two or more identical rooms. Hence CIE issued Technical Report 171: 2006 which presents test cases to assess the accuracy of lighting computer programs. However, these test cases are simple and the accuracy of daylighting computer programs can be different for more complex cases. The purpose of this paper is a comparison of differences in the results computed by various daylighting simulation programs for selected test cases according to CIE 171: 2006 and for more complex cases.

Energy-Saving Performance Studies of Road Tunnel Luminaries

2013 ◽  
Vol 291-294 ◽  
pp. 654-660
Author(s):  
Chao Yang ◽  
Shi Juan Fan
Keyword(s):  
Energy Saving ◽  
Light Emitting Diode ◽  
Road Surface ◽  
Light Sources ◽  
Road Tunnel ◽  
Lighting Condition ◽  
Average Luminance ◽  
Tunnel Model ◽  
Lighting Simulation ◽  
Reasonable Choice

Reasonable choice of light sources was the key to achieve energy-saving of tunnel lighting. Performance comparisons of light sources were completed, tunnel model was designed with lighting software-DIAlux based on characteristics and design demands of tunnel lighting. Simulation experiments for HPS (high pressure sodium) and LED (light-emitting diode) were made in the tunnel model, lighting effects of HPS and LED in each zone of the tunnel were analyzed, the results show that LED has higher lighting efficiency and can save more 40% power energy than HPS under the same lighting condition and the same road surface average-luminance, and LED has better road surface lighting effects and better color rendering than HPS.

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