A pin light assembly with specialized elastomeric grommet and cylindrical pin attached to the light lens for installation into the substrate of a spa wall that overcomes minimum outer diameter light limitations found in the prior art elastomeric grommet installation systems wherein the elastomeric grommet portion of the pin light assembly receives the LED light thereby eliminating the need for a tube to receive the LED and have a separate elastomeric grommet installed outside of the light lens tube. Optional features include retaining features such as a barb around the cylindrical pin or a retaining flange with undercut at the termination of the cylindrical pin.