7443 and 7444 halogen bulbs are dual filament bulbs. 7443 and 7444 LED bulbs also have dual functionality LEDs. In some cases there are two sets of LEDs on one bulb each for a separate function, while in other cases only one set of LEDs is used on the bulb and the dual functionality is distinguished by a higher and lower light outputs. LEDs with wattage less than 21W (7443) and 29W (7444) will require additional resistors to prevent hyper-flashing if used in signal lights.
BULB TECH SPECS:
7443 halogen bulbs are rated at 21W
7444 halogen bulbs are rated at 29W