· The un-natural lighting of florescent never made anyone look good. · It shows up in your photos as greenish tones. · Cokin's FLW & FLD filters neutralise these unpleasent tones. · Keep these filters on hand for work in public places (stations, resturants, offices etc.) where you can do nothing about the lighting. · FLW (A036) corrects the lighting from florscent "white" bulbs. · FLW (A138) is the graduated version for mixed lighting. · FLD (A046) corrects the lighting from florscent "daylight" bulbs. · FLD (A139) is the graduated version for mixed lighting.