Why there is minimal heat wasted with LED technology?
Unlike incandescenttungsten light bulbs, high-power LEDs do not radiate heat. Instead, LEDs conduct heat from their PN junction to the thermal slug on the LED package.Because the heat generated by LEDs is conducted, the heat has a longer, more expensive path to the atmosphere. In an LED, the heat path includes the thermal impedance from the junction to the slug, the slug to the board, the board to the heat sink and the heat sink to the atmosphere. The heat path for a tungsten bulb is almost straight into the atmosphere, starting with the thermal resistance from the filament to the glass and ending with the thermal resistance from the glass to the atmosphere.
