Bioprospecting and LED-based spectral enhancement of antimicrobial activity of microalgae isolated from the west of Ireland

•80 microalgae strains were isolated from the west of Ireland•Bioassay-guided fractionation for bioactivity testing was done against 6 pathogens•Blue light enhanced bioactivity in Prymnesium sp. and Chlorophyceae strains•Red light enhanced bioactivity in the benthic diatom Stauroneis sp. LACW_24•Chlorococcum sp. DMGFW_43 under blue LEDs had the highest MIC (110μg/mL MeOH, SA)