LED key performance indicators

(A) LED colors: led high bay light price is a very important indicator, is related to each LED lighting products must indicate the current LED's colors are red, green, blue, cyan, yellow, white, warm white, amber and so on. We design and orders at the time of this argument is that it must not be forgotten (especially beginners). Because of different colors, the relevant parameters have changed a lot.

(B) LED current: LED forward limit (IF) in the current multi-20MA, and LED light failure can not be greater than the current IF / 3, about 15MA and 18MA. LED luminous intensity only in a certain range is proportional to the IF, when IF> 20MA, the brightness enhancement has been unable to come out with the eye points. Therefore, LED's operating current general election around 17-19MA reasonable. Front against a common low-power LED LED (0.04-0.08W) between terms, except for some Piranha LED (some are rated at about 40MA value).

In addition to the continuous development of technology, high-power LED is also emerging as 0.5W LED (IF = 150MA), 1W LED (IF = 350MA), 3W LED (IF = 750MA) there are other more specifications, I mixed one introduced, you can check it yourself LED manual.

(C) voltage LED: The LED is commonly referred to as forward voltage, that is positive for positive power supply of the LED, the negative power supply is negative. Voltage relationship with color, red, yellow, green voltage is between 1.8-2.4v. White, blue, green voltage is between 3.0-3.6v, where I want to be reminded that there will be some differences with the group to produce the LED voltage, according to the subject provided by the manufacturer, when the outside temperature rises, VF will decline.

(Four) LED reverse voltage VRm: allows to increase the maximum reverse voltage. Exceed the values, the light-emitting diode may be breakdown.

(E) LED color temperature: absolute temperature K to indicate, i.e. a standard black body heated, the temperature rises to a certain extent, starting from the dark red color - light red - orange - white - blue, gradually changing, a light source and a blackbody color is the same, the absolute temperature of the blackbody at the time referred to the color temperature of the light source.

In fact due to the correlated color temperature of the black body radiation is near the light source color, the light source color performance evaluation value, not a precise color contrast, so with the same color temperature value of the second light source, the light color appearance may still slight differences. Color led high bay light for sale can not understand the source of the object's color capabilities, or how to reproduce the color of an object under the light source.
       (Vi) emission intensity (I, Intensity): Unit Candela, that cd. Defines a light source in a given flux direction unit solid angle for the light emitted in the direction of the (fat) light intensity (degree), the emission intensity for the point light source in terms of, or compare with the irradiation distance compared to the size of the luminous body small occasions. This amount is to show the ability to converge the luminous body in space emitted. We can say that the luminous intensity is to describe the light in the end how "bright", because it is a common description of the optical power and convergence capabilities. The larger the light emission intensity, the brighter the light source looks, while under the same conditions after the irradiation by the object, the brighter the light sources, therefore, described earlier flashlight are using this parameter.

LED is now also used to describe this unit, such as a LED is 15,000, the unit is mcd, 1000mcd = 1cd, therefore 15000mcd is 15cd. The reason for LED cents cd (mcd) rather than directly with the cd to represent, because before the first LED is dark, such as 1984's standard 5mm LED luminous intensity was 0.005cd, so it expressed by mcd.

Luminous intensity is represented by "brightness" of the disadvantage is that if the die exactly the same two LED, a good degree of converging the emission intensity is high. Therefore, users should not only focus on high I value when buying LED, depends on irradiation angle. Many LED high I was not to improve their emission efficiency to achieve, but the lens is extended irradiation angle narrowing realize that although useful LED flashlight, but the viewing angle is also limited. Further, the same die LED, 5mm in diameter I value more than twice as large 3mm, but only 1/4 of the diameter of 10mm, the larger the convergence characteristic because the lens the better.