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Testing the Tribute in Light over New York

John Makely / NBC News

The Tribute of Light illuminates the sky over lower Manhattan as technicians adjust the individual spotlights on Sept. 6 in New York.

Jonathan Sanger / NBC News

A technician adjusts part of the Tribute of Light on Sept. 6 in New York.

Technicians tested the Tribute of Light Thursday evening, ahead of the 11th anniversary of the September 11, 2001 attacks. 

John Makely / NBC News

The Tribute of Light is seen from The 9/11 Memorial on Sept. 6 in New York as technicians test the lights for the upcoming anniversary of the attacks of September 11, 2001.