UVC LED in combination with UVA LED can be used to improve surface cure of thin coatings. Various photoinitiators are included in waterborne UV PUD or 100% solid OPV formulations. The maximum surface cure speed, yellowing and chemical resistance are reported when cured under UVA LED alone or combined UVC and UVA LEDs.
Wang, Tong, Arceneaux, Jo Ann and YauSolving, Hwei-Ling, (2020). Surface Cure Challenges by Combining UVA and UVC LED in UV Curable Waterborne PUD or 100% Solid Systems. RadTech 2020 Conference Paper – 2020.