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LEDs

Measurements using 700mA driver from DealExtreme (10/9/2012)

With bridge rectifier and 2 LEDs
    In 13.0v @ 0.4A = 5.2w
    Out 6.4v @ 0.62A = 3.968w
    76% efficiency

Without bridge rectifier
    In 13.0v @ 0.37A = 4.81w
    Out 6.44v @ 0.622A = 4.00568w
    83% efficiency