ROADWAY LIGHTING Olowalu Tunnel Running parallel to the Pacific Ocean, the Olowalu Tunnel is a 349 foot (106 m) long highway tunnel bored directly out of the cliff side. It is part of the scenic, coastal Honoapiilani Highway 30 that encircles the western half of the island of Maui, Ha- waii and has the distinction of being the oldest highway tunnel on the islands. Challenges Originally, the tunnel was lit by twenty-two, 400W Metal Halide flood lights that were powered by an inefficient system of solar panels, batteries and an inverter to convert the AC to DC power. At one point thieves had disconnected and stolen the solar panels leaving the tunnel unlit for several years. The Hawaii Department of Transportation wanted to re-light the tunnel and use LED lighting to reduce the solar

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