Lampe simple allumage

Lampe simple allumage Source google image: https://slideplayer.fr/slide/2680975/10/images/19/DOUBLE+ALLUMAGE+Commande+de+l%E2%80%99allumage+et+de+l%E2%80%99extinction%2C+simultan%C3%A9ment+ou+s%C3%A9par%C3%A9ment%2C+de+deux+groupes+de+lampe..jpg