This filter set is optimized for minimized photobleaching due to the carefully optimized narrow, red-shifted exciter filter. What's more, unlike soft-coated filters and absorbing glass filters used for DAPI excitation, the unique hard-coated exciter does not "burn-out" under the intense UV illumination of modern fluorescence light sources. For specialized applications where brightness trumps contrast, use our DAPI-50LP-A set, which has the highest brightness on the market.