The examination of data from the Boston 787 indicated its APU battery did not appear to be overcharged by exceeding its designed voltage of 32 volts, according to Sunday's NTSB statement.

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But on Sunday the National Transportation Safety Board completed its examination of flight recorder data from the jet that caught fire in Boston, and determined that the affected battery did not exceed its designed voltage.

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Now the first mains-voltage LEDs designed as direct replacements for incandescent bulbs are arriving on the market.

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The technology also can sit in DC-to-DC devices, which are designed to adjust the voltage and minimize power losses.

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