Reflector luminaires are prepared for easy conversion and it is done in 1-3min.
In short terms you just loosen the reflector, unmount the glass and light source, then place the LED insert in the fixture and attach it with the existing screws / latches. Finally connect it to the cable and close the luminaire housing.
LED inserts are available for Mistral, Mistral Flex and Mini Mistral. STRIHL can also offer LED inserts for other models.