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Ungraded 7443 7440 T20 Automotive LED Light Bulbs Important Notes: We have made some improvements on this product compared to the old version, including the voltage range, PC cover, the ceramic heatsink and the lumen output. - These dual contact LED bulbs will only work for standard sockets(not for CK-,SRCK- and SACK-compatible vehicles). Please use the keywords(CK or Standard Test) on Youtube, the video will show you how to test the socket. - Since LED bulbs have lower wattage comparing with the stock bulbs, the 50W 6-Ohm load resistors or flasher relay might be needed to prevent the LED bulbs from hyper flashing, malfunction or trigger warning message on dashboard. Specifications: CAN Bus Compatible: No Dimension: φ0.84x1.82inches Power: 4 Watts Lumen Output: 600 Lumen Input Voltage: 10-30VDC Color Temperature: Cool White 6000K Beam angle: 360 degree Lamp Base: 7443 T20 dual filament wedge base, Not 3157 base BULB SIZE / CROSS REFERENCE: 7443 7440 7441 7440NA 7443NA 7444 992 W21WApplications: vehicle Tail lights, Brake lights, Reverse lights, Turn Signals, DRL Parking Light, Back Up lights.