The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.
Use a concentration of 3 µg/ml.
Flow Cytometry - Goat polyclonal Secondary Antibody to Human IgA (SureLight® Allophycocyanin) (ab99897)
Fluorescence excitation and emission spectra of Allophycocyanin in 100mM sodium phosphate (pH7.2) + 1mM EDTA and 1mM sodium azide. The emission scan was taken with excitation at 630nm. The excitation was taken with an emission at 660nm. The curves were normalized to equalize peak heights.