4257 WT21 White LED Reverse Backup Canbus Bulbs W/ Built in Resistors No Error Codes (PAIR)

Direct replacement bulb for 4257 WT21 Reverse, Backup Lights. Full metal heatsinking for reliable operation With a built in silent Fan to cool. Nonpolar and CK compatible electrical design. Plug and play, simple installation, no resistors needed. 1200 lumens per bulb. 1 Year Warranty Product Description Best Performance in Industry. Our Ultra Bright 24W 1200LM 4257 Wt21 White Canbus LED W/ Built in Resistors No Error Codes (2 Pieces) are white colored type LED lights that cover 360 degrees to provide maximum output. Unlike other brands, with resistors on both the filament, we created a CANBUS LED that only has a built-in resistor only on the turn signal filament. Having a resistor on both the filament will lead to melting the housing or the LED falling apart in the housing. We even took it one step future to insure the longevity of the bulbs by adding a cooling fan. The fan only turns on when the turn signal is on, to reduce heat when resistor is on. Our Design protects the LED from