SeaLux Marine Stainless Steel 4" LED Dome Light 5-1/2" base for Boat RV SeaLux Polished 304 grade stainless steel 4" LED dome light. Base diameter 5-1/2" Warm, concentrated and focused white light. 12 Volt 15 W, LED light bulbs draw low Amp For Longer Battery Life. Water Resistant Low Heat. Improved Beam Angle. Toggle On/Off Switch on base. Require mounting hardware screw size 6mm to install.