LED is a new type of semiconductor solid-state cold light source, which is an optoelectronic device that can convert electrical energy into visible light. Because of its low energy consumption, low heat radiation, and high luminous efficiency, LED is a new type of lighting device that is energy-saving, environmentally friendly, economical, and safe. Therefore, accelerating technical research and improving its luminous efficiency have become the most important issues of today. High-power LED should become the main body of lighting industry, and the safe and efficient drive research is the key to popularize and apply high-power LED. With the continuous development of LED technology, the advent of white LED, the lighting industry began the era of green lighting.
In general, the power of high-power LEDs is at least 1W or more. Currently, they are commonly used in 1W, 3W, 5W, 8W, and 10W. LEDs called "green light sources" are facing high currents (300mA to 1.4A). , high efficiency (60 ~ 120lm / W), brightness adjustable direction of development.
Optical properties
According to the light emitting principle of the LED, the light emitting luminance of the LED basically changes with the current of the LED. Controlling the luminous intensity of a high-power LED essentially controls its output luminous flux.
temperature
The size of the LED forward current also changes with temperature. Once the ambient temperature exceeds a certain value, the allowable forward current of the white LED is greatly reduced. In this case, if a large current is still applied, it is easy to cause white LED aging.
Volt-ampere characteristics
The high-power LED is a low-voltage, high-current driving device. When the LED voltage changes very little, the current changes greatly. When the forward voltage exceeds a certain threshold, known as the turn-on voltage, it can be approximated that the IF is proportional to VF.
In general, the power of high-power LEDs is at least 1W or more. Currently, they are commonly used in 1W, 3W, 5W, 8W, and 10W. LEDs called "green light sources" are facing high currents (300mA to 1.4A). , high efficiency (60 ~ 120lm / W), brightness adjustable direction of development.
Optical properties
According to the light emitting principle of the LED, the light emitting luminance of the LED basically changes with the current of the LED. Controlling the luminous intensity of a high-power LED essentially controls its output luminous flux.
temperature
The size of the LED forward current also changes with temperature. Once the ambient temperature exceeds a certain value, the allowable forward current of the white LED is greatly reduced. In this case, if a large current is still applied, it is easy to cause white LED aging.
Volt-ampere characteristics
The high-power LED is a low-voltage, high-current driving device. When the LED voltage changes very little, the current changes greatly. When the forward voltage exceeds a certain threshold, known as the turn-on voltage, it can be approximated that the IF is proportional to VF.
High power led ceiling down light
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