This is a lighting design proposal we did for Notre-Dame church located in the heart of Saigon. Combined with a renew of the surrounding urban and landscape lighting, we proposed a solution that will highlight the characteristic architecture and material of this monument, while considering the necessary variation of illumination for lighting pollution and energy consumption reasons. Heritage architectural lighting installation for a worship place is a different approach from any kind of project. The lighting has to reveal architecture as it is, a cathedral is not a show. In the same time this cathedral has a monumental presence in the city, and from this point of view it’s also a landmark by night. Our lighting proposal consider all these different aspects, including the different time of lighting, from the early evening, during the ceremony and late night. The lighting installation is controlled by a programmed system that can adapt the power of the light of the all installation, and creates different ambient along the night.