Lithographic printing plate precursor

A lithographic printing plate precursor comprising an image-recording layer, said image-recording layer being photo-polymerizable upon exposure with light having a wavelength of from 300 to 500 nm and comprising a mixture of sensitizers, said mixture comprising at least two different sensitizers according to formula I,

• wherein
• R1 to R6 independently represent a hydrogen atom, an optionally substituted alkyl group, an optionally substituted alkoxy group, a cyano group, a halogen atom, a dialkylamino group, an alkylarylamino group or a diarylamino group;
• L is a divalent linking group selected from the group consisting of:
• wherein n is an integer from 0 to 2;
• X represents S, O, or NRx;
• * represents the linking positions of the linking group L to the phenyl groups of Formula I;
• R, R′, and Rx represent an optionally substituted alkyl group;
• wherein at least one sensitizer of said mixture is an asymmetric sensitizer wherein R1≠R4 or R2≠R5 or R3≠R6 and wherein the total amount of asymmetric sensitizers in said mixture is at least 25 percent by weight relative to the total weight of said mixture.