1 / 32

Lighting design In Architecture

Lighting design In Architecture. Natural illumination & Artificial lighting. Environmental Systems in Architecture 2 nd lecture .. Eng. Nagham Ali Hasan. Properties of light:. Intensity (brightness) Frequency (wave length) Polarization (Direction of wave fluctuation). Speed of light:.

willa-craft
Télécharger la présentation

Lighting design In Architecture

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Lighting design In Architecture Natural illumination & Artificial lighting Environmental Systems in Architecture 2nd lecture .. Eng. Nagham Ali Hasan

  2. Properties of light: • Intensity (brightness) • Frequency (wave length) • Polarization (Direction of wave fluctuation) Speed of light: 299792.458 m/s ≈ 3*106 m/s The speed of light depends on the medium in which it is travelling.

  3. Controlling light • Principles of controlling light • Reflection: depends on the reflecting coefficient of this surface. “Reflectance”

  4. Transmission • how the light falling on a body is totally or partially transmitted • depending on the transmission factor of the given body.

  5. Absorption • how the light falling on a surface is totally or partially absorbed • depending on the absorption factor of the given material. • Refraction • the direction of its path is changed • Interference • Interference is described as the intensification or attenuation of light when waves are superimposed

  6. Lighting Resources: Natural Illumination Artificial Lighting daylight for interior spaces “Light from the sun” Such as : lamps “electric light- gas- oil lamps”

  7. Artificial Lighting

  8. Lamps:

  9. Gas-discharge lamps Florescent lamps Sodium Vapor lamps

  10. Electronic measurement devices for light

  11. Artificial Lighting Forms of lighting for internal areas Semi Direct light : 1- is preferred for all general illumination of work rooms, meeting room, rooms in public use and circulation zones An angle of illumination between 70-90 2- can provide uniform wall illumination.

  12. Directional Effect Forms of lighting for internal areas Some directional effects of light make it easier to recognize the details of a task; others make recognition more difficult.

  13. INDirect LIGHTING Effect FL are used in indirect/direct lighting, but they may also be combined with filament lamps. Height of room h~3m It can give an impression of a bright room free of glare even at high a law lighting level. Defused lighting Effect

  14. Artificial Lighting Forms of lighting for internal areas

  15. Visual field • المجال البصري Visual field ويحتوي علي مجال الرؤية (FIELD OF VISION) وهي المساحة المرئية عند تثبيت كل من العينين والرأس. مجال النظر(FIELD OF VIEW) وهي المساحة التي يمكن رؤيتها عند تحريك العينين مع الاحتفاظ بثبات الرأس. ويستعمل تعبير المجال البصري للتعبير عن مجال الرؤية الذي ينقسم إلي ثلاث مناطق: المجال المركزي: وينحصر في زاوية رؤية مقدارها 2درجة وذلك عند تركيز النظر علي شئ محدد. خلفية المجال المركزي: وتنحصر في زاوية رؤية مقدارها 40درجة وهي المنطقة الخلفية لنقطة التركيز. البيئة المحيطة بالمجال المركزي: وتصل إلي زوايا رؤية رأسية مقدارها 120درجة وزوايا رؤية أفقية مقدارها 180درجة وهي الصورة العامة أو البانوراما التي تراها العين دون تركيز.

  16. Visual Field (1) Field of View (2)

  17. Visual field (1), preferred visual field (2) and optimum field of vision (3) of a person standing (above) and sitting (centre, below) for vertical visual tasks. Preferred field of vision for horizontal visual tasks. Preferred direction of view 25°.

  18. Glare : • Glare is the discomfort or impairment of vision experienced when parts of the visual field are excessively bright in relation to the general surroundings. • Glare depends on the Reflectance. • Glare (m.lembert)= Illumination Intensity * Reflectance

  19. Control of Glare Glare is controlled by the following means: to limit the luminance of the lighting sources in the direction of the eye, e.g. replacing bright source with a number of weak sources, to screen the light sources from the view, e.g. introducing downstand screens or light-diffusing fittings to the luminaires, to reposition the work station, to use working surfaces, paper, office machines etc. that have matt surface, to raise the background luminance against which the luminance sources are seen, to construct external obstructions or low transmittance glass to limit daylight penetration, and to construct windows on adjacent or opposite walls to reduce contrast.

  20. Somedefinitions… • The luminance (Luminous Intensity) (I)…Unit: Candela: measure of intensity of light source in a given direction • The Luminous Flux (Φ)…Unit: Lumen: is amount of light energy radiated per second from a source of light. • i.e: The Luminous Flux (Φ)= 4π*L • The Illuminance: (E) …Unit: Lux: measure of light incident on the surface =Luminous Flux / area of the sphere surface = L/ r2 = lumen/ m2 lying at distance” r” from a source of light

  21. Somedefinitions… 􀂄 􀂄 Candela (cd): measure of intensity of light source in a given direction 􀂄 Lumen (lm): total amount of light emanating from a light source 􀂄 Footcandles (fc): indicates the density of light landing on a surface = lumens per sq.ft.

  22. Quantities and units

  23. Lighting design concepts ensure optimum visual performance, high productivity safety at operating costs

  24. INVERSESQUARE LAW • The illuminance on a surface which is produced by a single light source, varies inversely as the square of the distance from the source. • This is known as the INVERSE SQUARE LAW and is shown by the expression: • If the distance is doubled between the light source and surface, the illuminance E will fall to one quarter of the previous value.

  25. COSINELAW If a beam of light from a lamp hits a surface at an angle, the illuminated area increases but the illuminance on the surface is lower than when the light is pointed directly at the surface.. This is known as the COSINE LAW and is shown by the expression:

  26. The COSINE LAW is illustrated in the Figure. A 500 cd incandescent lamp is fixed at a height of 2 metres directly above a long bench, and the value of illuminance at point P is to be determined.

  27. Thank you Sheet 1: • lighting control at one of the following space: • Classroom • Surgery room • Reading area and shelves at library • Corridors • Bedroom and living rooms • Theater (stage area) • Office • Outdoor landscape

More Related