This document analyzes the potential energy and cost savings from switching to more efficient light bulbs in a household. It records data on light usage over a week for various rooms. Based on this, it calculates that switching all 9 frequently used bulbs to energy efficient bulbs could save over $30 per year and reduce electricity usage by over 200 kWh annually. It notes that even partially switching some bulbs or getting friends to change bulbs could provide meaningful savings and environmental benefits.

1. Lighting Our Lives: Energy Conservation Project Shanna Rounds

2. How much energy are we using? How much money could we save by switching to new, energy efficient bulbs?

3. Which lights do we use most often in the house? 3 kitchen, 1 dining, 1 living, 1 bath, 1 spare room, 1 bed room, 1 laundry At how many watts is each light bulb burning? How many hours do we burn each bulb each week? How much does it cost per watt per hour? Could we save money by buying energy efficient light bulbs at $4.99 each?

4. Seven day collection period Data sheet next to each light switch to record each time a light is switched on/off Note the wattage of each bulb Energy Star website calculator

5. Writing down each on/off = annoying. We used the lights less than normal. No pen! Oops, did not write it down every time… The err, therefore, is that we did not get the true total number of hours that we would use the lights during a normal week.

6. Hours Used

7. Total Cost… Week: $ .92 Month: $3.68 Year: $44.11 Total KwH… Week: 6.53 Month: 26.14 Year: 313.62 Light Watts Total Hours Kilowatt Hours Cost KWH Total Cost kitchen overhead 80 15.82 1.2656 .1417 0.18 above kitchen sink 60 13.98 0.8388 .1417 0.12 stove 40 30.55 1.222 .1417 0.17 dining room lamp 40 33.73 1.3492 .1417 0.19 bathroom 160 4.82 0.7712 .1417 0.11 living room standing lamp 100 4.35 0.435 .1417 0.06 bedroom overhead 100 0.82 0.082 .1417 0.01 spare room overhead 100 5.03 0.503 .1417 0.07 laundry overhead 100 0.67 0.067 .1417 0.01

8. So, according to this information we can conclude that if we switched to energy efficient bulbs… Total Cost… Week: $ .28 Month: $1.13 Year: $13.66 WE SAVE… $30.45 / year 217.24 KwH / year Old School Bulbs (Incandescent) Wattage Lumens Energy Efficient Bulbs Wattage 40 450 9-13 60 800 13-15 75 1100 18-25 100 1600 23-30 150 2600 30-52 Total KwH… Week: 2.01 Month: 8.03 Year: 96.38

9. We have only 9 bulbs we use often. In Sitka, these bulbs are often $4.99…so buy them on sale. Order them on-line. $1.99 X 9 = $18.00 These energy efficient bulbs last longer than incandescent bulbs. In the end, I think it is worth it for your wallet, and especially the environment!

10. I ask you to expand this: How about just replacing the two most frequently used bulbs? How about if you got just five friends to change their household bulbs? We would save the earth … 1058 KwH ! Consider that if whole countries like China are moving to outlaw these old bulbs, isn’t it time we learned watts up?