A safety or sports cone with controlled illumination is provided that is durable and easy to use. The cone has a light-transmitting body with an illumination device housing integrated into the top of the body that houses an illumination device that rests on a support ring and is accessed by a housing cap. The illumination device includes a light-emitting diode (LED) module, an LED actuator, a battery, and a battery housing. The illumination device is covered by a protective transparent shell. A reflective platform increases the illumination intensity at the top of the cone and provides additional protection from physical damage and contaminants. The illumination is activated and deactivated by pressing the center of the housing cap to affect the LED actuator. One or more ridges extending from the inner surface of the body below the support ring prevent unwanted activation of the illumination device during cone stacking.