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DRL halogen bulbs usually are 21W or 30W working power. If take LED bulb to replace it, CANBus led bulbs connected load resistor are necessary. DRL bulbs will be kept on while driving, If CANbus LED bulbs don't work well on heat dissipation, they can't run for more than 6 months. Here is our DRL bulb solution. We add heat control IC driver in LED DRL light bulbs, when operating temperature is too high, IC driver will adjust the current to reduce heat value, let LED bulbs heat dissipation sufficiently. We offer 2 year warranty to these LED DRL light bulbs.