There are no filters which can be "cut". There are blue bands around the bulb which supposedly give the light emitted a whitish tinge. See pic. All 'performance' bulbs will have service life less than the factory ones. Taking a conservative estimate, if they last one year, its ok in my book. Ideally , they should see around 1.5-2 years of use. The point is , if i get the extra safety of more light on the highway and city , i can justify the extra i have to pay for these bulbs, plus the shorter service life. Taking into account that the low beam on the Linea is not really encouraging. The service life of Night Breaker was mentioned as 320 hours (similar figure for Philips Xtreme Power) . And the NB Plus is advertised as having 50% more life than the NB. That makes it ~480 hours (on paper). Gurjinder.