This is the highest output LED tower cluster available for marine use. It uses 18 surface mount cool-white (SMD) LEDs arrayed in 6 planes for 360 visibility. Proprietary PWM Constant-Current chipset results in high performance across the entire 10-30VDC range. ThisLED bulbproduct may be used in red, green, bi-color, or tri-color navigation light fixtures that use a BAY15d bulb (double contact, offset pins). For anchor or stern white light we recommend our cool white version of this bulb. Features & Benefits: High output SMD LEDs Meets COLREG 3nm visibility requirements Meets anchor light visibility requirements for vessels up to 20m Meets color/visibility (bi-color lenses) required for vessels up to 12m Constant-current drive topology Over-voltage protection Thermally efficient design Important Notice:Navigation lights are tested and approved as a fixture with the original equipment source (bulb) already installed. The operator of vessel assumes all liability when using this product as a replacement for the original approved light source. The use of this LED light source in individual navigation fixtures has not been evaluated for compliance to USCG, COLREG, or any other navigational lighting standards or regulations. Fits Socket BAY15d (double contact, offset pins) Typical Applications Red, Green or Tri-Color Running Lights Dimensions (Diam. x H) 0.87 in. (22.1mm) x 2.14 in. (54.4mm) incl. base Input Voltage 10-30VDC Current Draw 250maA/12V125mA/24V LED Emitting Color Warm White or Cool White LED Type/Quantity 18 x SMD Beam Angle (FWHM) 120 (five directions)360 pattern Halogen Equivalency 10W Warranty 2 Years ILTW1157-SMW ILTW1157-SMC