Arlec grid connect bulb and power points DC convert smart WiFi hack
The leds are usually run as a long string - you can determine this by using a multimeter to beep out the leds. Count how many leds are connected in series. Times that by around 3V gets you the required DC volts the led string needs.
The led board might have a constant current driver chip that modulates a high DC voltage for the led string. The tuya module just outputs pwm, so you can get a mosfet or led driver for a 12V led (i assume you want 12V) and have it switch the pwm. The tuya module needs 3.3V.