By just using your eyes, you will not notice a 20% light improvement. If your old lamp can reach 50 meters, and if the NBU can only reach 60 meters (+20%), you will not notice that on the road.
Hindi naman talaga malaki difference. Mas maputi lang ilaw ng NBU. 10m is noticeable, that could be the difference between seeing a crossing child and applying the brakes 10m earlier.