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Illumination

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the act of illuminating or the state of being illuminated. a source of light, oftenly a light or lights, esp coloured lights, used as decoration in streets, parks, etc.

Veröffentlicht in: Ingenieurwesen
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Illumination

  1. 1. ILLUMINATION • DAYLIGHT AND ARTIFICIAL LIGHT • LAMPS : TYPES OF LAMPS, TYPES OF LIGHTING SYSTEM • DESIGN CRITERIA : GEOMETRY AND QUALITY CRITERIA
  2. 2. DAYLIGHT EFFICIENT USE OF NATURAL LIGHT
  3. 3. DAYLIGHT EFFICIENT USE OF NATURAL LIGHT THROUGH SKYLIGHT WITH GLASS BLOCKS
  4. 4. ARTIFICIAL LIGHT COMMERCIAL SPACE WITH GENERAL, DIRECTIONAL AND DIFFUSED LIGHTS
  5. 5. ARTIFICIAL LIGHT COMMERCIAL SPACE WITH GENERAL, DIRECTIONAL AND DIFFUSED LIGHTS
  6. 6. • DAYLIGHT • Glare, sparking, subdued and hazy • Depends on size, orientation and placement of window • ARTIFICIAL LIGHT • Static and unchanged • Brightness can be manipulated by dimmers DAYLIGHT VS ARTIFICIAL LIGHT
  7. 7. “HOW AN OBJECT IS SEEN IS INFLUENCED BY LIGHT” Luminous objects ( sun, stars and lamps) are visible because of the light they generate. The objects are visible because of the light that is reflected from the surfaces of objects. The ability to SEE WELL– ie • To discern the shape • Color • Texture • Differentiate one object from another is affected by the AMOUNT OF LIGHT AVAILABLE FOR ILLUMINATION BRIGHTNESS CONTRAST GLARE DIFFUSION and COLOR LIGHTING
  8. 8. • It refers to how much light energy is reflected by a surface • Degree of brightness depends upon the • color, • value and • texture of surface • A shiny, light colored surface will reflect more light than a dark, matt or rough textured surface. BRIGHTNESS
  9. 9. • Contrast between an object and its background helps in visual tasks to discriminate object shape and profile • Our eye adjusts to the average brightness of a scene (prefers even lighting, can respond to brightness ratios from 2:1 to 100:1) • A maximum brightness ratio of 3:1 to 5:1 between the task surface and background is recommended • Higher brightness ratio leads to GLARE CONTRAST
  10. 10. • Glare results when the the level of contrasting brightness increases • Direct glare : by the light source • Indirect glare or veiling glare: by reflecting surfaces GLARE
  11. 11. • Lamp consists of : • Fitting and • lamp ELECTRICAL LIGHT SOURCE : LAMP
  12. 12. • Incandescent lamp, florescent lamp and high intensity discharge lamp, fiber optics and LED TYPES OF LAMPS
  13. 13. • An integral part of an electrical system • It requires a power point, a housing assembly and a lamp • Form and shape of fixture and illumination is considered • A point source gives focus • A linear source gives direction • Volumetric source TYPES OF LIGHT FIXTURES
  14. 14. • Design of lighting system and pattern of light radiated by the source should be in harmony with the architectural features of the space • It should be in a rhythm • Even distribution of illumination is preferred by human eye • AMBIENT LIGHT : shadow less uniform light • FOCUS LIGHT : focus on the task, gives more contrast • SPARKLE LIGHT : used in chandeliers, TYPES OF LIGHTING
  15. 15. INDOOR LIGHTING
  16. 16. • Spacing of light from each other and wall depends on height LIGHTING LAYOUT
  17. 17. A good lighting design must satisfy functional and ergonomics requirement considering cost effectiveness. Depends on • Lighting level • Light direction • Glare limitation • Distribution of luminance • Color of light and color rendering QUALITY OF LIGHT
  18. 18. • Luminous flux (F) : The radiated power perceived by eye • Luminous intensity (I) : The Luminous Flux radiated per solid angle in a defined direction • Luminous intensity direction curve LIDC : Luminous intensity in all direction of radiation gives it distribution. It determines the radiation of lamp as narrow, medium or wide beam and as symmetrical or non symmetrical. • Illuminance (E) : Luminous flux radiating per unit area Optimal for seeing is 2000 lx Global radiation (clear sky) is 100000 lx • Luminance (L) : measure of perceived brightness TERMS

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