A340/A330 nose wheel light has two positions, Taxi and take-off. Taxi for taxying and then using take-off for take-off, however for landing, the light switch is commanded into the taxi and not take-off position. Check FCOM, normal procedures, landing.
The reason is to do with the angle of the beam, and the approach angle/attitude of the aircraft, is that it will further reduce visibility in the take-off postion, if flying in rain, low vis stuff.
I have that from Airbus in writing.