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Earth’s Changing Environment Lecture 17

Earth’s Changing Environment Lecture 17. Lighting Efficiency. Topics. Sunlight Incandescent Fluorescent Controls Using Daylight LED. Sunlight. Sunlight has peak in the middle of the visible spectrum with half the energy in the infrared. Some UV radiation. Incandescent Bulb.

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Earth’s Changing Environment Lecture 17

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  1. Earth’s Changing EnvironmentLecture 17 Lighting Efficiency

  2. Topics • Sunlight • Incandescent • Fluorescent • Controls • Using Daylight • LED

  3. Sunlight • Sunlight has peak in the middle of the visible spectrum with half the energy in the infrared. • Some UV radiation.

  4. Incandescent Bulb • Bulbs are heated filaments at 2,500 K. • The Sun is 5,800 K. • Spectrum of hot filaments has more red.

  5. Bulb Efficiency • Only 5% of energy input produces useful light. • Spectrum is different from sunlight.

  6. Fluorescent Bulb

  7. Tube Fluorescent Lights • Efficient • Reflectors increase light level.

  8. Compact Fluorescent Bulbs • Efficiency is 4X incandescent bulb. • 14 W bulb produces light level corresponding to 60 W bulb • Last 10X longer, 10,000 hours

  9. Payback Period Calculation • Stop and work problems

  10. Lighting Controls – Switch Off • Switch off campaigns are effective. • Fluorescent lights should be switched off if you’ll be gone more than 10 minutes.

  11. Lighting Controls - Automatic • May irritate occupants. • Less efficient than switch-off

  12. Bringing in Daylight • Has the right spectrum. • Uses no energy. • In some locations, need to avoid over-heating and UV effects.

  13. Skylights

  14. Skylight Tubes

  15. LED Lighting • Very Efficient • Monochromatic • Expensive • No IR – No heat

  16. White LED

  17. White LED • Very Efficient • Monochromatic • Could be the lighting of the future

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