This Excel calculator from GE can help you estimate your energy savings from upgrading lighting systems, as well as calculate the environmental benefits of taking action.
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To hear the story of how high school students used this tool to help local businesses, check out this March 2011 article.
After finding savings opportunities at their school, a group of students in Iowa visited small businesses to help them do the same. Using the above General Electric Eco Estimator, students helped business owners calculate the savings potential for replacing T12 fluorescent lamps with more efficient T8 lamps.

