A robust and easy to install obstruction illuminator is herein disclosed. The obstruction illuminator features an elongated body with a first end and a second end opposing the first end. The body of the obstruction illuminator has an inner cavity, which extends between the first and second end. An artificial light source is fitted to the first end of the body and an emission lens is fitted to the second end of the body. The artificial light source is configured to emit light into the cavity towards the second end. An optical condenser element is provided into the inner cavity of the body between the artificial light source and the emission lens. The optical condenser element receives light from the artificial light source as well as condenses and directs the condensed light toward the emission lens. The emission lens refracts the light into a pattern suitable for warning about the presence of an obstacle.