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Light Pollution

Light Pollution. Why is light directed upward?. Light directed upward is wasted. Los Angeles from Mount Wilson Observatory 1908. Los Angeles from Mount Wilson Observatory 1988. Wouldn’t it be more effective to put the lights above and direct it down?. Too much light goes upward.

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Light Pollution

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  1. Light Pollution

  2. Why is light directed upward?

  3. Light directed upward is wasted.

  4. Los Angeles from Mount Wilson Observatory 1908

  5. Los Angeles from Mount Wilson Observatory 1988

  6. Wouldn’t it be more effective to put the lights above and direct it down?

  7. Too much light goes upward. needs better shielding

  8. better shielding very little goes up

  9. Street Light Spectra Low Pressure Sodium High Pressure Sodium Mercury Vapor

  10. Street Light Spectra Low Pressure Sodium High Pressure Sodium Mercury Vapor

  11. Street Light Spectra Low Pressure Sodium High Pressure Sodium Mercury Vapor

  12. Low Pressure SodiumOrion

  13. Filtered

  14. Low Pressure Sodium best outdoor lighting for all safety concerns pierces fog expensive bulb energy efficient brighter than high pressure sodium

  15. Why don’t people like low pressure sodium?

  16. Why don’t you like low pressure sodium? don’t like the color can’t see color looks like the traffic signal exceptions?

  17. high pressure sodium

  18. Mercury Vapor

  19. Low Pressure Sodium

  20. Recessed Lighting

  21. Light Trespass

  22. Does more light mean less crime?

  23. Crime 98% 80% Adequately Illuminated 2% 20%

  24. loss of night vision glare

  25. Light Pollution Losing Battle Rational Argument Against Emotional Argument in Favor Population Growth

  26. San Diego Southwestern College Texas High School aircraft carriers NY subways

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