An evaluation model for light environments. Thorbjörn Laike & Tommy Govén

Transcription

1 An evaluation model for light environments Thorbjörn Laike & Tommy Govén

2 Aim of the project To develop a neutral method that builds on harmonized standards within Sweden and in Europe concerning energy and lighting. The method is holistic since it evaluates the lighting conditions in both visual and non-visual aspects based on the knowledge found in research in the field.

3 European Standards SS-EN 9 Describes a method for measuring the energy use on a monthly or yearly basis Builds on the assumption that the minimal requirements of SS-EN 6- is fulfilled In SS-EN 9 LENI Lighting Energy Numeric Indicator SS-EN 6- Lighting in indoor work environments

4 Evaluation of a lighting installation AQ -index. Total Light Experience VBE index. Energy efficiency LENI index EN 9 8. Product efficiency LLE index (mean value). Lighting control. Recommended Maintenance

5 Visual Biological Experienced value Emotional

6 Visual the possibility to perform the visual tasks within the environment over time Experienced value Biological how light within the environment influences the daily and seasonal biological rhythms Emotional the emotional reaction on the first impression within the environment as well as the reaction over time Evaluation of a lighting application

7 Visual - Task area lighting - Visual performance - Luminance ratio - Contrast - Glare Perceived value Biological - Ocular light - Circadian effects - Mental health - Alertness Emotional - Comfort Safe - Dynamics - Colours - Colour of light Evaluation of a lighting application

8 Human Quality Aspects of Lighting table. Visual index describes the possibility to perform the visual tasks within the environment over time Biological index describes the how the light within the environment influences the biological daily and seasonal rhythms. Emotional index describes the emotional reaction on the first impression within the environment as well as the reaction over time. Evaluation principles Each parameter is to be evaluated in a scale of -. The final index is an average compliance of the sum of all parameters. All evaluations is to be based on the individuals prerequisites. Parameters Fulfilment of basic requirement Adequate illuminance level Uniformity Good colour rendering Good luminance distribution Good contrasts Avoidance of direct glare Avoidance of indirect glare No reflections in screens Individual controls Flexibility Orientation Use of daylight Evaluation principals Each parameter is to be evaluated in a scale of -. The final index is an average compliance of the sum of all parameters. All evaluations is to be based on the individuals mental health. Parameters Ocular light Appropriate light distribution and colour temperature Sufficient illuminance/ luminance levels within the visual field Algorithmic lighting to fit the circadian effects Working hours with daylight Daylight penetration Location/Latitude Orientation Type of glazing Evaluation principals Each parameter is to be evaluated in a scale of -. The final index is an average compliance of the sum of all parameters. All evaluations is to be based on the individuals well-being. Parameters Modelling and accent lighting Appropriate colour temperature and colour rendering of light Décor and the use of colours Variations in colours and brightness in the visual field Lighting in style with the architecture and décor Balance between complexity and unity of the environment Security and pleasantness Use of daylight To high or low luminance within visual field Average compliance index of VBE-parameters = excellent = very good = basic needs = unsatisfactory = poor

9 V B Human Quality Aspects of Lighting Table. Visual index Quality evaluation based on design criteria for the visual tasks (see encl table.) Average compliance index of individual VBE-parameters =excellent =very good =basic needs =unsatisfactory =poor Emotional index Subjective quality evaluation of the total environment (see encl table.) Average compliance index of the individual VBE-parameters =excellent =very good =basic needs =unsatisfactory =poor Biological index Mental quality evaluation of the total environment (see encl. table. ) Average compliance index of the individual VBE-parameters =excellent =very good =basic needs =unsatisfactory =poor VBE-index E VBE-index Visual Biological Emotional -index (VBE-index) ()

10 Spider chart V B E Visual Biological VBE-index VBE- index () Emotional

11 Evaluation of a lighting application VBE-index Visual Biological LENIindex LLE-index Emotional Controls Maintenanc e VBE-index AQ-index IMC Conference Light&Health th March 7, T.Govén - Fagerhult