BOSTON - One LED if by land, and two if by sea? The Old North
Church, a beacon for Paul Revere's famous warning of the
movement of British forces, and a symbol of the American
Revolution, has gone high-tech with the installation of light-
emitting diodes, or LEDs. The energy-efficient lights illuminate
ceiling vaults inside the church, whose steeple was used to
display two lanterns as a signal about British troop movements
on April 18, 1775 - the night described in Henry Wadsworth
Longfellow's famous poem, which included the line: "One if by
land, and two if by sea." LEDs haven't yet replaced the slightly
less-modern compact fluorescents that the church began using two
years ago in its modern versions of the steeple lanterns. The 18
strips of LEDs inside the church's sanctuary - replacements for
old-fashioned incandescents - may seem an anachronism at the
most visited historic site in a city with a rich Revolutionary
War legacy. But the lights are tucked into crown molding,
illuminating the graceful white ceil