As dictated by the Rule of Cool, aliens, robots and magical creatures in fiction have a tendancy to give off light from various places on their bodies, including eyes, mouths, veins, and markings. This trope is about creatures who have a single light source on their chest, which is usually either centred straight in the middle (as is the case with most robotic examples) or off to one side if it represents their actual heart. If the Heart Light shoots some sort of beam, it's a Chest Blaster. Some forms of Chest Insignia may overlap with this Trope if they glow or emit light.