Maud send me this info: Please find here attached a photo of the green and red light indicators.
The price is 5.90 euros/unit without taxes and without transport. The dedicated 24V 1 W light bulbs are also available. They are supplied in bags of 10 (17.20 euros without taxes and without transport. I am very sorry but the light for the gas is not available from us anymore.
See photo attached. If these are the same lights they are not expensive.