A bright light is a source of illumination that is particularly intense or luminous. GLARE, with five letters, is a strong, often unpleasant light that can cause discomfort or blindness. NEON, also with four letters, is a type of gas used in lighting fixtures to create a bright, glowing light. An IDEA, also with four letters, is a thought or concept. The SUN, with three letters, is the star at the center of our solar system and is the primary source of light and heat for the Earth. Klieg, with five letters, is a type of bright light used in film and television production.