What does 194 bulb mean? The 194 bulb is also a T10, with a slightly lower wattage at 3.9 watts. Its light intensity is at 2 candlepower, meaning it is dimmer and ideal for continuous lighting. An endearing thing about the 194 is its long service life, of up to 2500 hours. Also, it produces heat and has only one level of brightness. SYLVANIA Long Life miniature bulbs provide standard performance for your car or truck's interior and exterior auxiliary lighting. Ideal for use in your car's back up/reverse, trunk, dome lights and more, Long Life bulbs are a direct replacement for your vehicle.