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Lighting

Light Reflection & Transmission Color Glare. Lighting. ID 320 – LIGHTINGACOUSTICHVAC Done by: Amjad AlFawaz. LIGHT. LIGHT is the portion of the electromagnetic spectrum to which our eyes are visually sensitive to.

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Lighting

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  1. Light • Reflection & Transmission • Color • Glare Lighting ID 320 – LIGHTING\ACOUSTIC\HVAC Done by: AmjadAlFawaz

  2. LIGHT • LIGHT is the portion of the electromagnetic spectrum to which our eyes are visually sensitive to. The power with which light is emitted from a lamp is measured in Lumens (lm) Done By: Amjad AlFawaz

  3. LIGHT • Efficacy: The ratio of light output to energy input Light out = Lumens = EFFICACY Energy in watts Candlepower: Describes the intensity of the beam in any direction. Done By: Amjad AlFawaz

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  5. LIGHT • Illuminance: Is equal to the number of lumens falling on each square foot(meter) of a surface. • The unit of illumination or light : footcandle ( lux) lux = lumens square meter Done By: Amjad AlFawaz

  6. LIGHT • Object’s Brightness refers to the perception of a human observer. • Object’s Luminance refers to the objective measurement of a light meter. Done By: Amjad AlFawaz

  7. LIGHT • Light falling on an object can be: • Transmitted • Reflected • Absorbed Done By: Amjad AlFawaz

  8. Reflection of Light: 1-Specular Reflection  smooth, polished surfaces. (the angle of reflection is = to the angle of incidence) 2- Semi-specular reflection  irregular surfaces such as hammered, brushed or sandblasted materials. (part of the light spread and the greatest intensity reflected at an angle equal or near the angle of incidence) 3- Diffuse Reflection  matte, rough surfaces. Done By: Amjad AlFawaz

  9. Transmission of light: 1- Clear, transparent material  transmit light. 2- Diffusing translucent material  scatter light. Done By: Amjad AlFawaz

  10. COLOR • White light is a mixture of various wavelengths of visible light. • Color Temperature: Used to describe the warmness and coolness of a light source. Low CT, warm  yellow,orange,red colors High CT, cool  green, purple, blue colors Done By: Amjad AlFawaz

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  14. GLARE • Glare is a visual noise that interferes with visual performance. • Glare occurs when one part of the visual field is much more brighter than the average brightness to which the visual system is adapted. • This causes: discomfort, or loss in visual performance and visibility. 1- Direct Glare. 2- Indirect\Reflected Glare. Done By: Amjad AlFawaz

  15. Direct Glare is caused by a light source sufficiently bright to cause annoyance, discomfort or loss in visual performance. -from light fixtures, ceiling and windows. Done By: Amjad AlFawaz

  16. -distance between an offending light source to the center of vision. • Can reduce glare using shielding devices The closer the worse Done By: Amjad AlFawaz

  17. Using optical controllers to eliminate or reduce direct glare. Done By: Amjad AlFawaz

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  20. window blinds or perforated screens to limit the amount of direct sunlight coming into the space. Done By: Amjad AlFawaz

  21. Upward to the ceiling Done By: Amjad AlFawaz

  22. Indirect Glare is caused by the reflection of light sources on a glossy surface. Can be avoided by: -using matte, less glossy materials. -Relocating the light source. -rearranging the interiors Done By: Amjad AlFawaz

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  27. Page 367, Activity Needs Done By: Amjad AlFawaz

  28. Biological needs 1- the need for spatial orientation: • Define changes of levels • Direct people Done By: Amjad AlFawaz

  29. Biological needs 2- the need to understand structural form: • Direct light gives form to objects while diffuse light flatten objects (three-dimensional quality) Done By: Amjad AlFawaz

  30. 3- The need to focus on activities: • Highlighting important areas to create order and attention Done By: Amjad AlFawaz

  31. 4-the need for cheerful spaces: • Right amount of light to eliminate any gloomy feeling • Combing different lighting types create cheerful spaces Done By: Amjad AlFawaz

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  33. 5-the need for security: • Darkness is a lack of visual information; cause fear and expect danger. • A man needs to be aware of his surroundings and get information. Done By: Amjad AlFawaz

  34. 6- the need for communication. Done By: AmjadAlFawaz

  35. Lighting Design First: Determine tasks and activity in the space. Second: Illuminate things based on the determined activity. Third: create a level of brightness contrast Done By: Amjad AlFawaz

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