Analyze of some important property of LED
LED color
The led color is terrible important property ,echo led will indicate correspond color, there are red ,green , blue , yellow , white , warm – white in led color, we should tight remember those color when design , because of the different color will result in vary change for design work

* LED currently
LED currently The led forward limit currently as 20mA,the luminous decay can’t be over IF/3, about 15mA or 18mA. the forward currently is proportional to luminous intensity in a certain scope. the luminous will not increase when the forward currently over 20 mA, the reliable input currently is in 17~19mA, those value only suitable for common low power LED（0.04-0.08W）, the rated power of high power led as 40mA.
With technology development gradually , various high power led was appeared on LED market, such as 0.5WLED（IF=150MA），1WLED（IF=350MA），3WLED（IF=750MA）there are more property in product datasheet , please refer to correspond product manual.
*LED voltage the connect way of led forward voltage is that led positive pole connect to positive pole of power , negative pole connect to negative pole of power. the led color relate to input voltage, for example red ,yellow and green of voltage between in 1.8—2.4v, white ,blue of voltage between in 3.0—3.6v, there are some different even from same bitch,
* led reverse voltage
The reverse voltage of led over limit reverse voltage will breakdown LED.
*led intensity
How may Intensity does the led have?
*Luminous Flux
Luminous Flux The stream of photons coming from a light source,the value of luminous is define by human , there are different result between the human and animal , the human has different feeling through saw the different color ,the yellow green light is sensitive color for human’ eyes. the red light is not sensitive color for human’ eyes.
* LED service time The LED can met to 50,000 hours in general datasheet Some professor put out a report ,they talk about the high quality led working for 50,000 hours before it still has 60% luminous , the led is not quit work, the luminous decay will appear with time is fly.
*Led lit angle,
the light scattering agents were blended with led that the LED light -emitting adjusted to met variety of angle needs.