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The kx bulb has an extra pair of wire contacts (4 instead of 2) per side. This decreases the amount of current each contact has to handle and decreases the amount of heat build up on the socket. The regular 3057 or 3057K bulb can be used, but it will probably burn out a bit faster and can damage the socket over time.
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What is the Difference between a 3057K and 4057K bulb?
3057K - Design AMPS: 2.1, Rated Life: 2,000 4057K - Design AMPS:2.23, Rated Life: 4,000
Are the 3057 and 3057KX turn signal bulbs compatible?
Well. I work at NAPA and it called for a 3057kx which we naturally don't have in stock. But when the customer pulled the bulb out it was a 3157. which will fit in its place. It might be some sort of long life bulb. Just put a 3157 in there. that's what most brake lights are.
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