Performance of photocatalytic lamps on reduction of culturable airborne microorganism concentration

► S. epidermidis and A. niger spore reductions with photocatalytic lamps were studied. ► S. epidermidis was reduced up to 92% independent of temperature or humidity change. ► The black light photocatalytic lamps completely inactivated bacteria at 25 °C, 55% RH. ► For A. niger spores, rising humidity or temperature could lower their concentration.