| The Cambridge Energy Alliance will host four events this spring where residents can exchange up to three incandescent or CFL lightbulbs for LED lightbulbs. LED bulbs use 5-6 times less energy than incandescent bulbs and 40% less energy than CFL bulbs, resulting in significant savings on energy bills. LED bulbs are also mercury-free and can last up to 20 years. The swaps are free and open to all Cambridge residents. The events will offer standard A19 LEDs, which fit most lamps and fixtures, and BR30 LEDs, typically used for recessed lighting. Exchanges are limited to 3 bulbs per household to ensure supply for all participants. Upcoming bulb swap events: - Cambridge Winter Farmers Market, Saturday, March 17, Cambridge Community Center Gymnasium, 5 Callendar St., 10am – 1pm
- Cambridge Science Festival, Friday, April 20, Cambridge City Hall, 795 Massachusetts Ave., 12–3pm
- Cambridge Bike Committee Spring 2018 Ride (at the post-ride celebration). Saturday, May 19, Main Library, 449 Broadway, 12-2pm
- Cambridge Arts River Festival, Saturday, June 2, Lechmere Canal Park, 11am – 6pm
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