41 mm tip to tip Our bulbs are not the cheaply made poor quality commonly found on Ebay and other sites from China. Each bulb is made for a TRUE voltage range of 12-24 volt systems and have the high quality Epistar chips. Most cheaply made bulbs state they are for 12 volt systems. Your 12 volt system is fully charged well over 12 volts to at least 12.7 up to 13.3 volts. Cheaper bulbs become hot at these voltages and the individual diodes will discolor and eventually fall off when the solder reaches its melting point around 370 degrees F failing well before 40,000 hours. Don't settle for dim battery draining standard incandescent bulbs!
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