radiant

adjective

• 1sending out light; shining or glowing brightly:a bird with radiant green and red plumage
• (of a person or their expression) clearly emanating great joy, love, or health:she gave him a radiant smile
• (of an emotion or quality) emanating powerfully from someone or something; very intense or conspicuous:he praised her radiant self-confidence

• 2 [attributive] (of heat) transmitted by radiation, rather than conduction or convection.
• (of an appliance) designed to emit radiant energy, especially for cooking or heating.

noun

• a point or object from which light or heat radiates, especially a heating element in an electric or gas heater.