Abstract: A method is directed to coating a light source. The method provides a setup stage, a coating stage and an optional drying stage. The setup stage involves a loading of a luminescent spray solution into a reservoir of an inkjet printer cartridge, a setting of a spraying distance between a platform and the inkjet printer cartridge, and a creation of a spray profile drawing corresponding to the light source. The coating stage involves a secure positioning of the light source on the platform, and a printing of the spray profile drawing where the luminescent material is sprayed upon the diode(s) of the light source. The final drying stage implements a crosslinking technique or curing technique to dry the coated diode(s).