Our roots may be in electrical contracting, but with more than four decades of experience, GLS has grown and been equally recognized for technology and security offerings as well. Our consistently high ratings as the most experienced and reliable contractors in the metropolitan area has won us the loyalty of some of the most notable names on Long Island. A traditional of excellence, quality and professionalism, safety in the workplace, and on time performance empower us to light up Long Island and New York. A single-source electrical contractor - including in-house services and strategic partnerships with manufacturers, consultants, engineers and integrators - GLS brings value to our clients while attracting new pones as well.