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Tunnel lightsTo solve the vehicle to enter or exit the tunnel brightness mutations enable visual black hole effect "or" white hole effect "for tunnel lighting special lamps. Light source for general use: sodium lamp,Website:http://www.roleds.net, metal halide lamp sometimes electrodeless lamp. As a special section of highway tunnel, when the vehicle into and out of a tunnel, through the tunnel lampTunnel lampIn the process, there will be a series of visual problems. In order to adapt to the changes of vision, it is necessary to set up an additional lighting.