Shall balance the cost and workability.
In PL pigments world, the finer of PL pigment particle grains, the lower of the pigment glowing luminance intensity, and the better workability. So at the same luminance intensity, the finer in particle size, the higher in cost. Consequently to select pigment in workable particle size range as coarse as it can be to save cost.  Contact us for suggestion and recommendation in pigment item selection.