This Osram Sylvania 3W/24V is an extremely reliable bulb. Trucks such as 18 wheelers rely on this bulb because of its highly quality projection. Not only do these bulbs have a reputation of being a superb quality, long lasting, reliable bulb, but they are selling at affordable prices. This bulb has an SV8.5/8 festoon base, an average rated life of 1000 hours, and a T3.25 shape.