Condensation inside headlamp is a natural phenomenon
Condensation occurs when atmospheric air containing water vapor or humidity enters the headlamp through the vents due to temperature difference. A thin film of fog can form on the inside surface of the headlamp lens. The thin fog will clear and exit through the vents during normal operating condition.

Condensation & fogging of headlamp lens may happen during rain or after washing.
Moisture condensation inside the headlamp lens will disappear gradually by switching ON the headlamp in high beam and driving the vehicle at 30 to 40 Kmph speed for about 15 minutes.
Time for evaporation will vary depending on the humidity of the ambient air.

Note :- If fog inside the headlamp does not evaporate bring the vehicle to KTM Authorised Dealer for inspection.