A tasty clash failed to live up to expectations during the first half at a packed Matchroom Stadium.
Few chances and just as few shots on target for both sides mean it is goalles at the half-way stage.
Alex Revell had Orient's first sniff of goal when he curled a shot just past the post, on seven minutes.
Dean Cox livened up a dull game with a speculative curler on the half hour mark which drew a fingertip save from stopper Casper Ankergen.
A blow hit Orient inside the first ten minutes when Adam Chambers was forced off injured.
Stephen Dawson came on despite still feeling the lingering effects of a dead leg.
Precious little action during the opening stages saw the game contested in the midfield, and neither evenly matched side could forge a break-through.
An error by skipper Ben Chorley saw Brighton surge forward and Glenn Murray test keeper Jamie Jones from 10 yards, Chorley was tackled when he decided to try and make something happen with a dribble of his own.
That was the sum total of what League One table-toppers Brighton created.
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