Pro Series HD Gen2 Xchangeable Flush Mount (XFM) lights are exchangeable from within the hull without hauling the boat. The XFM Gen2 lights combine a variety of quality marine grade materials, such as AB2 aluminum bronze and OceanLED's Tritonium™ coating allowing easy maintenance for annoying sea growth. Exceptionally low profile and unlimited hull mounting options with a very simple installation. Great solution for new installations as well as retrofit applications. Plug-and-play quick connectors make this light a quick fit. Equivalent: 2 x 150W HID/Metal HalideHull Spacing: 4 or more lights with spacing of 3-6'Hole Cut-out: 4 1/2"