This BA15D headlight bulb is dual filament, operates from 6 to 9 Volts positive chassis or negative chassis. The low beam is shielded limits the oncoming traffic glare. Up to 1700 Lumen output for the low beam. Up to 3400 Lumen output for the high beam. When the low beam is illuminated only the low beam led's on both sides light. Both led's on each side illuminate when the high beam is illuminated. This bulb is rotated 90 degrees to fit sockets that make the led bulb up and down, please check your existing socket. The bayonets will protrude on the same sides the the leds are faced. The bulb is made with CSP led's that emulate the original filament for the best focused light. The led uses 90% less energy and your lights could not change from low beam to high beam or the headlight flickers which load equalizers may be required please see product 65832 to fix the issue. The headlight is available in White 6000K, Daylight White 4500K or Warm White 3000K. The White 6000K is the brightest about 5% brighter than Daylight White or Warm White. The Warm White best matches the incandescent look of the original or classic car, motorcycle or truck. The bulb is made from aircraft aluminum to keep the led's cooler so they last longer. The M.O.L. maximum overall length is 2.356". The M.O.D. maximum overall diameter is .944". The length from the base of the heatsink is 1.595". The width of the heatsink is .706". The diameter of the base is 15mm. The base has two bayonets that are even. The base has two contacts on the bottom. Comes one per package. The low beam has anti dazzle to help the glare from oncoming vehicles. CE and Rohs.