Money Saving Lighting Retrofit
1/3/2012
New Lighting Saves Client 50% on Electric Bill
The client's originally installed in 1986 lighting system, consisted of 400W metal halide (HID) high bay light fixtures. Typically this type of fixture generates a lot of waste heat and has a fairly high insertion loss factor. The true connected load of that HID fixture is 458w. They do not hold up very well when you cycle them more than once a day, meaning when they are on they are on for the day.
The lighting replacement system we selected for this application was a high efficiency, T-5 HO solution. K-B Lighting Manufacturing Company, Inc. of Philadelphia, PA, fabricated the fixtures to our exact performance specifications.
When we compared the new fixture connected load of 228 Watts Vs. the original fixture load of 450 Watts, the net delta per fixture was - 222 Watts. It does not sound like a lot until you multiply that by 78 units = 17,316 Watts per hour x 12 Hours per day = 207,792 Watts, multiply that by 5 days a week = 1,038,960 Watts, multiply that by 4 weeks per month in average = 4,155,840 Watts on an average year that add up to 54,025,920 Watts or 54,025.92 KW's per year saved. That simple example does not take into consideration the reduced running time by utilizing occupancy sensors. Based on our 30+ years experience in the business, occupancy sensors, when properly selected and correctly installed save energy and money. Running time savings estimates are dynamic predictions, what you start to see after an installation adjusted and complete, is the areas you thought had traffic surprisingly, actually do not. The client could not believe at first that a lighting system some much brighter could actually be saving money. Until they got their third electric bill.