Ir led strip attenuation Does the cause that cause have those?

The is infrared radiation proportional to the light radiation power .the change of the size of signal output by light radiation power as direct。this could lead to ir led strip output changes. In other words, The infrared radiation would be affected, but very slightly.There are several reasons for Ir led strip attenuation。

(1)The light source is gradually getting Ageing，light radiation power is declined and output signal got it low 。
(2) The resistance value of light source is correct or not.
(3) The input power plug.’ Oxidation can cause contact problems.

Measurement results ultraviolet led light and Blue led light
Because ultraviolet light has a shorter wavelength than other led light .so Ultraviolet led light too weak to Glow.If you want to gain that facular concentrated, high brightness, and no stray light, no black hole, no shadow or dark areas. The technology are very difficult. it uses only ordinary Reflection bowl and lens.

we think in terms of more than 4pcs lens solution to the question of ultraviolet led light.

How Are led power supply Classified?

The led power supply are drive methods in sorts

Constant current mode:

*This is the best drive way on the led power supply, The chief objection to this drive way is prices higher.
*In load circuit, Circuit of Constant current can supportshort circuit, A ban on stuck-open.
*We know law of energy conservation. According to law of energy conservation that current output is constant in current output mode. the output voltage which change with current is large enough.
*In Constant current mode there is a minimum LED number limit. Echo led power supply has maximal loading capacity of current & voltage .

Constant voltage mode:
*Output voltage is fixed when determination of the constant voltage control circuit parameters. The law of energy conservation same will apply in constant voltage mode. the output current which change with output voltage is large enough.
*In load circuit, Circuit of Constant voltage can support stuck-open, A ban on short-open.
*The voltage changes will influence brightness in the LED after rectification
*Configure the appropriate to Control of the Uniformity of Luminance of LED in constant voltage mode

Considerations for Handmade weldability of SMD LED

Many factories were equipped without this wave soldering or mounting. using only the Handmade weldability of SMD LED. Working in this way, should pay attention to what?

1、The melting products but should be maintained as low as possible. Temperature of Welding Gun is 280° C-300° C lower than use Welding Gun as usual。solder wire with a melting temperature of about 220°.Suggested the Temperature of Welding Gun as far as possible low.

2、Notice the speed wants quickly ，weldability speed will rise about four times is best way. Welding Gun and solder wire blend should very tacit, must undertake the training of technicality, carry out very hard in the practice otherwise. That means, should send solder wire to Welding Gun right off, when Temperature of Welding Gun reaches 180°, Try to avoid extended periods of time at the SMD LED.

The voltage and current of LED

First we have the introductions

the yellow(585-595nm)﹑Red(600-650nm) and green(565-575nm) :

Their voltage is 1.8~2.4V(outside the range).and the vavg as 2.0v.

The blue(585-595nm)﹑green (600-650nm) and write(565-575nm) :

Their voltage is 2.8~4.0V(outside the range).and the vavg as 3.3v.

Problem of LED heat dissipation

This is an important part of design of led . because problem of heat dissipation. can even affect the length of LED life，also led to the falling of the reliability of the system .so Solving the heat of LED is the technical problem . Several misunderstandings about the optimization in problem of heat dissipation are analyzed .

Analysis for the misunderstanding in LED heat dissipation
1、Inefficient internal quantum-mechanical。cannot guarantee a 100% that produces photons When ecombination of photogenerated holes and electrons. incomplete parts must be translated into heat.
2、Internally generated photons will should not be total amnesty。In this section, incomplete parts also must be translated into heat.
3、The user can reduce excessive reliance on Conductive Materials .
4、Over use of heat shrink tube. But overusing the heat shrink tube has brought the heat damage to the led product.

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 .