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NSI Lighting Controls was acquired by Leviton Mfg. Co. in 1999.  NSI manufactures portable lighting control and dimmer systems for the music industry for live entertainment applications.  NSI products can have any of the following manufacturer names:  NSI, Leviton, Leviton/NSI, NSI/Leviton.

Popular items include Luma-Net wall control stations like the NSI 404 CP; Dimmers like the NSI DS12; and lighting controllers like the NSI MC7008.