C:\Users\Arclight\Presentations\Arclight Sustainability

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C:\Users\Arclight\Presentations\Arclight Sustainability

  1. 1. Using light as a medium in a sustainable way
  2. 2. Agenda <ul><li>Our role as lighting designers </li></ul><ul><li>Basic needs for lighting </li></ul><ul><li>Sustainability </li></ul><ul><li>Environment </li></ul><ul><li>Light Pollution </li></ul>
  3. 3. Our Role as lighting designers <ul><li>Three factors: </li></ul><ul><li>Social- Has to be an environment you want to be in </li></ul><ul><li>Economic- Has to work financially </li></ul><ul><li>Environmental-Must be energy saving </li></ul>
  4. 4. Our role <ul><li>We take responsibility of using energy on </li></ul><ul><li>behalf of others </li></ul><ul><li>How can we be more responsible? </li></ul>
  5. 5. Our role <ul><li>Use daylight wherever possible- </li></ul><ul><li>USA test: 26% increase in speed of learning in schools where they increased daylight </li></ul><ul><li>Control our lighting in most cases </li></ul><ul><li>Direct the light to the task only </li></ul><ul><li>Use energy efficient lamps where possible </li></ul>
  6. 6. Basic Lighting Needs: <ul><li>Visibility </li></ul><ul><li>Task at hand </li></ul><ul><li>Visual comfort </li></ul><ul><li>Social communication </li></ul><ul><li>Mood and atmosphere </li></ul><ul><li>Health, safety and well-being </li></ul>
  7. 7. Sustainability <ul><li>Consider at all times: </li></ul><ul><li>Environment </li></ul><ul><li>Energy Saving </li></ul><ul><li>Waste </li></ul>
  8. 8. Environment: <ul><li>Landscape- </li></ul><ul><li>the natural environment we are responsible for </li></ul><ul><li>Considerations: </li></ul><ul><li>Subtle external fittings </li></ul><ul><li>Low level lighting where possible </li></ul><ul><li>Tie in texture and colours to suit landscape </li></ul><ul><li>Light only what needs to be lit </li></ul><ul><li>Let us see the night sky in all its glory </li></ul>
  9. 9. Light Pollution: <ul><li>Problems: </li></ul><ul><li>Glare </li></ul><ul><li>Light Trespass </li></ul><ul><li>Energy waste </li></ul><ul><li>Visual Clutter </li></ul><ul><li>Over Lighting </li></ul><ul><li>Up-light </li></ul><ul><li>Urban sky glow </li></ul>
  10. 10. Glare: <ul><li>Uncomfortable brightness of a light shining into your </li></ul><ul><li>eyes, leaving you unable to see much of anything else </li></ul><ul><li>Extreme examples are the setting sun and oncoming </li></ul><ul><li>car headlights. </li></ul>
  11. 12. Light Trespass (Light Spill) : <ul><li>Light that shines where it is not needed or wanted. </li></ul><ul><li>Light from somebody else's property lighting up your property </li></ul><ul><li>shining in your windows, or otherwise interfering with your </li></ul><ul><li>enjoyment of your property. </li></ul><ul><li>Light shines beyond the intended target and onto adjacent property. </li></ul><ul><li>It can be reduced or eliminated by using a shielded light fixture and by aiming lights down where the light can be used. </li></ul>
  12. 13. Light Trespass:
  13. 14. Energy waste: Problem: Global Warming- Methane and carbon dioxide emissions 30 to 50% of the light we produce is never used, shining sideways or upwards instead. Misdirected light, using too much light, and leaving the lights on all night when nobody is around, are all wastes of energy
  14. 15. Energy Saving <ul><li>lamps- work with the new technology available to us like </li></ul><ul><li>warm fluorescents, IRC etc.; </li></ul><ul><li>Less is more- plan the lighting well- use less lighting </li></ul><ul><li>Dimming- give clients dimming options at all times </li></ul><ul><li>Presence detectors- keep costs down by lighting only when present </li></ul>
  15. 16. Energy Saving <ul><li>Some light sources, in order of energy efficiency, are </li></ul><ul><li>Type of light source Colour Efficacy (lumens per watt) </li></ul><ul><li>_____________________________________________________________________________________________ </li></ul><ul><li>Low pressure sodium yellow 80 - 200 </li></ul><ul><li>High pressure sodium pink/amber-white 90 - 130 </li></ul><ul><li>Metal Halide bluish-white/white 60 -120 </li></ul><ul><li>Mercury Vapor blue-greenish white 13 - 48 </li></ul><ul><li>Incandescent yellow/white 8 - 25 </li></ul>
  16. 17. Visual Clutter: Visual confusion: Traffic lights near neon, street lighting and Christmas lights all in the same environment Ugly landscape: Compromising nature and architecture with overflow of lamp posts, glare, lamp colours etc
  17. 18. Over Lighting: Light levels exceeding those needed for the task. Too much light often arises from a &quot;more is better&quot; philosophy - Businesses trying to outshine their competitors Over-lighting results in indirect glare, where illuminated objects (buildings, garages or car showrooms) are too bright compared to their surroundings.
  18. 19. Over Lighting indoor: Only 30% of spaces in offices are on a working plane Apply light sparingly in response to architecture/user needs Use task lighting on desk levels and LV mood lighting in other areas Codes of practice are guidelines only, interpret them with common sense
  19. 20. Up-light: Improperly aimed or unshielded lights emit light above the horizontal Causes the dome of sky glow over towns and cities Typically, lights that cause up-light also cause significant glare and light trespass. Unshielded garden lights, most &quot;security&quot; lighting, most streetlights, and billboards with bottom-mounted lights are typical sources of up-light Using shielded lights that are aimed down so that no light is emitted above horizontal will stop up-light and reduce light trespass and glare.
  20. 21. Up-light:
  21. 22. Up-light : Full cut off Semi cut off No cut off
  22. 23. Sky Glow: <ul><li>The brightening of the night sky over towns and cities </li></ul><ul><li>A symptom of light pollution, specifically of up-light </li></ul><ul><li>The glow is caused by the scattering of artificial light by water </li></ul><ul><li>droplets and dust in the air </li></ul><ul><li>Comes from poorly designed and improperly aimed light and from light reflected from over-lit areas </li></ul><ul><li>The excess brightness obscures faint astronomical objects </li></ul>
  23. 24. Sky Glow: <ul><li>Sky glow is stray light in our atmosphere that can be </li></ul><ul><li>seen for 100s of kilometers </li></ul><ul><li>Our sky is no longer inky black </li></ul>
  24. 25. Sky Glow: Earth from Cosmos, Photograph by NASA
  25. 26. Sky Glow: Ireland
  26. 27. Sky Glow - causes: <ul><li>Billboards lit from below </li></ul><ul><li>Badly aimed or misdirected street lighting </li></ul><ul><li>Outdoor wall washers shining upwards [up-down] </li></ul><ul><li>Ground spots too strong and incorrectly directed </li></ul><ul><li>Security Lighting-search lights-flood lights </li></ul><ul><li>Crane lighting-building sites </li></ul>
  27. 28. Sky Glow - effects: <ul><li>Insect and animal breeding patterns interrupted </li></ul><ul><li>Disruption of food chain [nocturnal creatures/insects] </li></ul><ul><li>Global warming </li></ul><ul><li>Astronomers forced to use unpolluted areas </li></ul><ul><li>Change in migratory bird patterns </li></ul><ul><li>Change in plant life </li></ul>
  28. 29. Sky Glow - solutions: <ul><li>Consider height mounting </li></ul><ul><li>Use motion sensors </li></ul><ul><li>Specify fittings with lock mounting-maintenance </li></ul><ul><li>Limit direct glare </li></ul><ul><li>Use ‘eye- lid’ wall lights </li></ul><ul><li>Use shielded street lamps </li></ul><ul><li>Light as much as possible from above- wash down </li></ul><ul><li>Only light what needs to be lit </li></ul><ul><li>Limit intensity of signage lighting </li></ul><ul><li>Light Bridges from above </li></ul>
  29. 30. SLD-final note <ul><li>A good Sustainable lighting Design should meet the </li></ul><ul><li>qualitative needs of the visual environment without </li></ul><ul><li>compromising the natural one </li></ul>

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