The SV42 from Sea Vision ($647) uses a large, convex crown glass to create a wider beam that reaches depths of 30 feet. The bronze housing is durable and corrosion- proof and can be mounted as a through-hull or on the surface. Available in white or blue, the light has six LED modules, draws only 0.75 amps and is available in 12 or 24 volts. Underwater Lights USA, (866) 772-0130; www.seavision.com