I bought these thinking they were identical in length to the 194 tube but they are NOT. Check out my measurements of both lamps and you will see that they are well over the 2.3cm length described in the product photos. The actual difference is even greater when installed as the 194 bulb actually extends beyond the protruding portion of the glass tip and the LED bulb doesn't sit as far as the original. For most applications, a few extra millimeters may not be critical. , but I broke / failed to calibrate the autometer's mechanical gauge by putting in a 3mm longer bulb and it hit the internals. With that being said, and my plan being to replace 194 incandescent bulbs with LEDs, I didn't want to risk testing this with every one of my expensive sensors. I just bought another set of LED bulbs from another seller. 1 star for incorrect product information and wasted time. The size was the only reason I chose it over other brands. Other than that they are very bright working bulbs and I tested them to make sure they work in the socket.
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