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Heat is a form of energy, and it makes temperature increased and changed the condition of object.

• Incandescent Lamp : 95% of energy is changed to IR or Heat
• LED : Most of electrical energy (85%) is changed to heat. No IR. The heat of LED comes from the chip.

LED package delivers the heat, generated by thermal design, to atmosphere.

The light intensity of the LEDs degrades over higher temperature.

Color of LED changes according to the increase of temperature

Life time decreases according to the increase of temperature of LED

Temperature of LED increases according the increase of current

Working area decreases according to the increase of thermal resistance.