Energy Efficiency Energy Efficiency of Lightingof Lighting

Skyler ValenzuelaSkyler Valenzuela

Laura TschaplinskiLaura Tschaplinskihttp://products.mercola.com/Images/light-bulbs/energy-

efficiant.jpg

Artificial LightingArtificial Lighting

Incandescent BulbsIncandescent Bulbs Delivers 85% of household Delivers 85% of household

lightinglighting Light instantly, warm light, Light instantly, warm light,

excellent colorexcellent color Low efficacyLow efficacy Short average operating lifeShort average operating life Least expensive costLeast expensive cost HOT.HOT. Overall- least efficientOverall- least efficient

http://www.energysavers.gov/your_home/lighting_daylighting/

index.cfm/mytopic=12120

Artificial LightingArtificial Lighting

CFLs CFLs (Compact Fluorescent Lamps)(Compact Fluorescent Lamps)

Combine popularity of Combine popularity of incandescents with efficiency incandescents with efficiency of fluorescentsof fluorescents

Flicker slightly when turned onFlicker slightly when turned on Cost 3-10 times more than Cost 3-10 times more than

incandescents, last 6-15 times incandescents, last 6-15 times longerlonger

Operate most efficiently within Operate most efficiently within a moderate temperature a moderate temperature rangerange

http://renaissanceronin.files.wordpress.com/2008/10/cfl.jpg

http://www.smud.org/en/rebates/PublishingImages/cfl-lamps.jpg

Artificial LightingArtificial Lighting

LED LED (Light-emitting diodes)(Light-emitting diodes)

Lasts 20 times longer than Lasts 20 times longer than incandescents, 10 times longer incandescents, 10 times longer than CFLsthan CFLs

More expensive initial cost, yet More expensive initial cost, yet lower operating costlower operating cost

Durable- resistant to thermal Durable- resistant to thermal and vibration shock and vibration shock

Typically cast light in one Typically cast light in one direction at a narrow angledirection at a narrow angle

Overall- most efficient, still Overall- most efficient, still developingdeveloping

http://www.elightbulbs.com/pics/category_icons/main_category_footer_08.jpg

Flood vs. Spot LightsFlood vs. Spot Lights

general lighting: lighting designed to provide a substantially uniform illuminance throughout an area, exclusive of any provision for special local requirements

accent lighting: directional lighting to emphasize a particular object or to draw attention to a part of the field of view

directional lighting: illumination on the work-plane or on an object predominantly from a single direction.

Natural LightingNatural Lighting

Efficient use of windows Efficient use of windows reduce the need for reduce the need for artificial lighting during the artificial lighting during the dayday

South- daylighting and South- daylighting and moderating seasonal moderating seasonal temperaturestemperatures

North- daylighting, even light, North- daylighting, even light, little glare, and no heatlittle glare, and no heat

East + West- good East + West- good daylighting in morning and daylighting in morning and even, high glare, admit heateven, high glare, admit heat

http://www.interiorandhealth.com/blog/wp-content/uploads/2008/02/light1.jpg

Natural LightingNatural Lighting

SkylightsSkylights North- constant cool North- constant cool

illuminationillumination East- maximum light and East- maximum light and

solar heat in morningsolar heat in morning West- afternoon sunlight West- afternoon sunlight

and heat gainand heat gain South- greatest potential South- greatest potential

for winter heat gain, allow for winter heat gain, allow unwanted summer heat unwanted summer heat gaingain

http://www.bosworthroofing.com/images/skylights_2.jpg

Natural LightingNatural LightingLight tubesLight tubes

““A clear, unbreakable polycarbonate dome mounted on a storm-tested, aluminum A clear, unbreakable polycarbonate dome mounted on a storm-tested, aluminum flashing on the roof directs sunlight down into the area below through a high-flashing on the roof directs sunlight down into the area below through a high-performance reflective transfer tube. This tube connects to a domed translucent performance reflective transfer tube. This tube connects to a domed translucent diffuser that distributes natural light evenly throughout the area without heat diffuser that distributes natural light evenly throughout the area without heat gain.” gain.”

No replacement for lighting at night, but may complement No replacement for lighting at night, but may complement electric lights to reduce energy costselectric lights to reduce energy costs

http://greenbydesign.com/wp-content/uploads/2008/10/natural_lighting_solatude.jpg

BibliographyBibliography"About Sun Dome Tublar Skylights, Skylight Manufacturer, Natural Lighting and Color "About Sun Dome Tublar Skylights, Skylight Manufacturer, Natural Lighting and Color

Rendering by Sun Dome." Rendering by Sun Dome." Sun Dome Tublar Daylight SkylightsSun Dome Tublar Daylight Skylights. Web. 05 Apr. 2010. . Web. 05 Apr. 2010. <http://www.sun-dome.com/tubular_skylight_features.html>. <http://www.sun-dome.com/tubular_skylight_features.html>.

"CFL vs LED - Green Face-off | Greenzer.com." "CFL vs LED - Green Face-off | Greenzer.com." GreenzerGreenzer. Web. 05 Apr. 2010. . Web. 05 Apr. 2010. <http://www.greenzer.com/face-off_5>. <http://www.greenzer.com/face-off_5>.

  "Energy Savers: Lighting and Daylighting." "Energy Savers: Lighting and Daylighting." EERE: Energy Savers Home PageEERE: Energy Savers Home Page. Web. 05 . Web. 05 Apr. 2010. Apr. 2010. <http://www.energysavers.gov/your_home/lighting_daylighting/index.cfm/<http://www.energysavers.gov/your_home/lighting_daylighting/index.cfm/mytopic=11970>. mytopic=11970>.

http://www.eco-smart.org/presentations/1-LED-Lighting-Education.pdfhttp://www.eco-smart.org/presentations/1-LED-Lighting-Education.pdf