LED light bulbs

Matt's Household Electric usage
Jun-May Household Electric Use

The graph above from Seattle City Light shows 12 months of our household electric usage (Jun-May). Each bar is 2 months, so the first is Jun-Jul and the last is Apr-May. The lighter colored left bar is the prior years usage, and the darker colored right bar is the current year (Jun 2012-May 2013) usage. Can you guess in which 2-month period I replaced all our light bulbs with LEDs?

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