Interpretation of VF, IV, WL, IR and luminous flux conversion

V stands for voltage.

F stands for positive.

I stands for current.

R stands for reverse.

WL stands for wavelength.

Therefore: VF represents the forward voltage, generally low-power led red, yellow, orange, yellow-green vf is 1.8-2.4v, pure green, blue, white vf is 3.0-3.6v. IF is a forward current, and the IF of a typical low-power LED is 20mA. IR is the reverse current,

It is generally measured under the reverse voltage of 5v, with less than 10uA (micro-amps) and less than 5uA and 0uA. WL is the wavelength of light, visible light has its own wavelength, different wavelengths correspond to different colors, such as red light is generally 615-650nm (nanometer), blue light is generally 450-475nm. White light is a blue chip + phosphor modulation, so no wavelength, measured by color temperature (less than 3000k yellow. 3000k-7000k is white, more than 7000k blue).

What does the LED Vf mean? What is the effect of its size on the LED?

Vf is a forward voltage, but the forward voltage is not necessarily higher as the forward voltage increases. You see that as long as it is a low-power led recognition book will have a vf value, there is a If value, no matter how much the vf value, (red, yellow, yellow-green, orange is generally 1.8v-2.4v, white, blue, green Generally 3.0v-3.6v). If is 20mA. The two are complementary. For example, two white lights, one is 3.0v, 20mA, one is 3.4v, 20mA, meaning that the first lamp, you give it a voltage of 3.0v, the current flowing through it is the normal rated current of 20mA, but Two lights, you have to give it a 3.4v voltage, the current flowing through it is 20mA. Here Vf and If are not proportional; but a yellow light and a white light, such as the yellow light voltage is 2.0v, the voltage of the white light is 3.3v, this yellow light and 2.0v voltage and this The currents flowing through the white lights at a voltage of 3.3v are the same, both at 20mA, where Vf and If are not directly proportional. Therefore, Vf and If are absolutely proportional to the same lamp. Whenever you use it, no matter how big Vf is, you only need to control the current flowing through all the lamps to be 20mA.