ED–parameter analysis

About LED–parameter —- although the subject might seem very simply。It really matters for your work. that are purposeful, and that are appropriately sequenced。

1、ForwardVoltage of LED (VF)

Different LED can have different VF. actual data is cited as follows:

* RED & YELLOW 1.8~2.5V；

* GREEN & BLUE：2.7~4.0V;

The VF and luminous intensity could be different Even at the same color.

Ratedcurrent of LED

The Ratedcurrent of LED are many and various， The most frequently used LED is 20 mA。the Ratedcurrent of high-power as 40mA~350mA.

LED power

With the improvement of LED power, we put forward more requirements towards LED power.So it’s much more type for your requirement.most common types are 70mW、100mW、1W、2W、3W、5W. Our customers can choose that LED power according to the requirements. shall be determined through reasonable evaluation methods by referring to the base schematics。

Most of the damage that’s occurred was input voltage or input current are too high. Damage mean that shorten service time 。the way could no longer be used. But the led light-illuminance will be affecte If the voltage level is too low.

Integrated above, This is an improper usage would be unable to play its full role。Familiar with LED specification is very important for we can be a better application of LED

Today Let us see how Test of light transmittance

Test of light transmittance with integrating sphere or Distributed photometric analyzer in Lamps Industry。this step is not use the Lamp housing . And recode the real-time running data.

Then Install bulbs and sockets in the lamp housing.，it’s time again to test.Gets the test result from integrating sphere or Distributed photometric analyzer .

Finally We gained light transmittance Along with the recorded evidence（the relations between the ratio）,

From this may sneak a peek at, different shell of the material and difference. this is call optical loss。

There’s something else going on:

1.   The experiment made with common glass showed that this adhesive has good transparence.( exceeded 92% ) . Super white common glass exceeded 91.5% .but if adopt shell with sand-blasting will decreased 10% . PC lampshade after increased diffusion agent ，the light transmittance at 80 to 86 per cent.

2. The integrating sphere is efficient for test of light transmittance.

3. The user can choose the Lamp housing applying to engineering application by collecting analysis data.

4. After testing , The sample also had to observed grossly .

In order to achieve adjust color temperature, set conduction voltage drop of Cool white、 warm white led module with input voltage to the same . use power transistors(MOS1& MOS2) to control open and closed for the Cool white、warm white led module . The signal of PWM2 interfaced GATE of MOS1to control Cool white led array . The signal of PWM3 interfaced GATE of MOS2 to control warm white led array.

Operation process：

Each of the first and second switches alternatively performs a turn-on operation and a turn-off operation. First cool white led array is turn-on when PWM2 as high logic level and or PWM3 as low logic level . Then to do the opposite。 the warm white led array is turn-on and the cool white led array is turn-off. Use the duty-cycle of PWM to modulate the turn-on time of Cool white、 warm white led module . Linear LED dynamic display system based on linetype array, which is the effect of persistence of vision, is manufactured. So can implement the effects of change Of color temperature.

Comprehend such basic concept concepts of optical engineering

The first and most important concept was Luminous flux & light-illuminance and light- lightness .The basic concept and definition of optical engineering are presented in this paper. We are walk way too much: about concept before . Perhaps I can give you a brief explanation, outlining The main points today.

In ordinary language：

Luminous flux as how many light had been granted（Add up all the light）

light-illuminance refers to how much light was reverberation of object ‘average surface.

light- lightness means: If light is not completely absorbed by the object, some light is said to be reflected. returns a specified part of light — We called them light- lightness.

The unit of Luminous flux is Lm , the unit of light-illuminanc is Lux. the conversion relation of them is: 1 lm illumination in 1 square meter of a surface. its 1 lux at this point. The unit of light- lightness is candela. highlight intensity of candela in a solid angle,within this range the total highlight intensity —- we take it as 1 lm.

Research of knowledge point LED lumens
According to concept to know:
Cover the same ground from different angles to know that led lumens. What “Lumen” meant?
Okay, More seriously, the lumen represents the intensity of light,which is the luminous flux. In short, the lumen is light in the amount of the object surface. The equation is simple:research Led lumens new concept. The amount of light to shine on object surface ,call “lumen”.So The lumen is the luminous flux unit.

How to support Night vision surveillance camera with ir led strip

Night viewing device in Dark night; Let’me see how it did work.We recognize that Night viewing camera can captured the scene in night. Such as shooting wildlife or CCTV (Closed-circuit television). Because it can see everything clearly with camera in night.And the people have been so lost that I could not see. The reason for this ir led strip to help it finish all work. When close the Infrared filter, As we have seen that The infra-red rays reflected from the forms image. and not the visible light reflected from the forms image. So the Night vision surveillance camera can they take in their photos in Dark night. The ir led strip mainly a matter of Night vision surveillance camera . we can understand that ir led based on voluntary irradiation.

Is it right for the Electromagnetic radiation has an important effect on human health.
The Electromagnetic radiation is one of the ordinary elements in the nature. It has a century-long reputation of being poisonous was right after all While succinct, the above question a lot of questions unanswered. So all people want get a answering questions quickly and succinctly. might better be “Yes” or “No”. However tough questions, actually has many factor in here. Such as The electromagnetic wave frequency, intensity (please see pic as follows)and differences for human ‘physical, etc.

If everyone was forced to summarise my answer, This is possible, If the Electromagnetic radiation is higher than a certain level may lead to harmful for the human’body, as for the Electromagnetic radiation as low-power; There was no evidence to proof that possibly hurt our body will do small harm to human health.

LED strip with Anti-ultraviolet
There are two color of LED strip with Anti-ultraviolet, one is yellow other is white. can effectively that ultraviolet rays under 400~500nm. These are normally widely used for unwanted ultraviolet rays’ place. such as : semiconductor factory, electronic archives, libraries, museums, art galleries, art galleries, exhibition shop, printing ink for color inspection, antique warehouse, food production workshop etc.

* Yellow led strip with Anti-ultraviolet
During the Producing of semiconductor , there was no ultraviolet rays under 500nm. The Yellow led strip with Anti-ultraviolet  without ultraviolet rays under 500nm. And these led strip are very energy efficient, long server time.So it’s good for Communication, bio-tech, new material industry photoelectron technology and high efficient energy saving technology

* White led strip with Anti-ultraviolet
The White led strip with Anti-ultraviolet has not ultraviolet rays under 400nm. Specific energy-efficient, long life, quality and stability is an indispensable quality of space embellishment.

Definition for uv led strip
The ultraviolet rays are one of the electromagnetic wave, the electron atoms jump from the high-energy bands at low energy band, will release excess energy with electromagnetic waves . The stronger the energy of electromagnetic wave , the short the wave you can . the human can see that400nm-780nm（1nm=10-9m）,
The 400nm of electromagnetic wave will shows “ blue ” color,
The 780nm of electromagnetic wave will shows “orange” color.
The wavelength of ultraviolet rays are smaller than 400nm. The wavelength outside the ultraviolet rays area, , it is known as Ultraviolet, the wavelength of UV as 100-400nｍ, These rays would not be visible to our eyes. But the cameras can see what human eyes can ‘ t: The ultraviolet rays.

What is the material that makes this led?
many user(inquiring mind) think about this all the time. What is the material that makes this led?
However that is also very important for led manufacturer. Because The use of the correct materials was crucial.
This article lists some commonly used the material of led as follows: