spectrum parameter

•         The characteristic parameters of spectrum parameter mainly includes: wavelength of peak emission、spectral radiant bandwidth and spectral power distribution.spectrum of monochrome LED light are single wave peak,wavelenght and bandwidth can indicate static frequency characteristic of led. white light led is a composite of multifarious monochromatic spectrum.all led spectrum characteristic can be represented by spectral power distribution P(λ),furthermore,but also can get the colorimetric parameters by calculating and simulating. spectral power distribution test can be differentiate varieties of light colors from mixed light via spectrometer system.spectrometer system is commonly described by two models, the prisms (With special lenses and prisms we can manipulate this light.) and grating.

prism or grating have come to maturity for LED spectrophotometer.

Analysis of the Measuring Position for luminous flux

There are two ways to test luminous flux, integrating Sphere System and variable angle photometer. variable angle photometer this may be the most precise way to test luminous flux.and is a test processing that needs much time. So today, luminous flux of test are generally used on the integrating Sphere System. there are basically two types test structure for luminous flux test。

One way to do this is to use the center of test container for led test. —–led are located in the center of test container.

Another approach is to store the led in the brim of test container.

The quality of led

Good quality is the critical success factor of LED. How distinguishes the led quality?

1、Led chip:LED chip is just one component of led, but it’s a very important one. the quality of led determines led luminance and luminous degradation (luminous output degradation of the 2500 hours is less than 4%~5% in good quality).good quality led not only has high luminance but also has low luminous output degradation.
2、Light efficiency:light efficiency means a high luminance in the same business functionality. becuase the smaller the power consume is, the more likely it is to achieve save power. the coherence of led color temperature is getting better ,the more the led price.
3、Led power supply: led power supply quality have become key issues in this area. led power factor guarantee that it reach over 0.9.the process of the key
working procedure guarantee ability, constantly improving the quality of led.
4、The condition of heat disspated:
*heat disspated materials
*heat disspated struction

Radiation diagram
There are many parameters, but two that I believe are most important for your led project  .  first we will concentrate on the radiation diagram.

The various states in the diagram each represent one configuration of the led. from this point (0.1)of view,  that small ellipse which creates magnificent light effects. and ellipse right is the relative value perspective, the lower-left portion is an luminous instensity. most led is three-dimensional. so led radiation diagram

in a much more robust way than you can understand multi-Dimensional Space Description of led. which gives you the freedom to choose the led that suits your led project needs.

How would you assess the led can save energy or not?

LED is light emitting diode, the electricity energy can be transformed into visiable light by the led.but the emission of light that does not derive energy from the temperature of the emitting body. and traditional light from the thermal radiation,just like:incandescent and halogen lamps.so different light source has different lighting effects.
the lighting effects was measured by luminous flux and input power. this unit is 1m/w.

for example, the simple light device:ther are has 3*14W grille lamp.when it tries to use the 14W/1200lm lamp tube,
Also equipped with 2 pcs 14W ballasts. We worked out the system power as 18+32.5=50.5W , grille effects(LOR) as 70%.
so the light effects as 3600*70%/50.5W＝49.9lm/W .

if substitute the grille effects and substituted was slightly higher than in the 49.9lm/W . we can say that the substituted is energy-saving.

simulate the led heating

The led heating has long been a problem.the temperature changing regularity of led was studied during run time by mathematical simulation (monitor their heating process during processing).an apparent mthematics algorithmic method was used to simulate the temperature change.

first measured calculating equivalent parameters of led on run time.
*A simple proportional index is established between the intput voltage and temperature(K).
*temperature time constant T
*thermal hysteresis timer

you can write heaters of mathematical model After measurement.
set up mathematical model by which simulate the heating process.

Know more about led parameters

led chip size:
led sharp can divide into two kind different sharp. which is circuit and other is square.

general Knowledge of led:
User can see different colour light of led . these light complexes are consist of different wavelength . for example:
the wavelength range of the red light to be betweet 620~630nm.
the wavelength range of the green light to be betweet 527nm.
the wavelength range of the blue light to be betweet 470nm.
the wavelength range of the yellow light to be betweet 585nm.
in fact the white light was one of the blue light,topped with phosphor.

the number of led chip:
the most common is to employ one chip to a led . which may be appropriately altered four led chip.for example: the straw hat led lamp have here is two led chip.

viewing angle of led:
viewing andle of DIP led general is 120°（or 45°）.led strip have used the 45°; viewing andle of SMD LED as 120°.

led voltage:
there is a great variety of led voltage, different colour different power has different operation voltage.
red / yellow: general use for 1.8V~2.1V
white/blue/green: general use for 3.0V~3.6V

led currently:
small led(include smd led and dip led),The input led currently level should not be set to the point of distortion(<=40mA).
high power led,reliability evaluation is realized by using DC currenlty is 150mA.

The big advantage of led source
The led light source is light emitting devices.led are well-respected because they bring the new light standard and
make a material difference to improve peoples lives quality. to sum up, there are for advantage need further discussion and clarification:
*long service time: the High power LED light source is in pure solid state, the led has a longer life than traditional light devices(with
workers at half light power reaching one hundred thousand hours).for example:replace the traditional car light with led, the led has a longer servier time than car’servier time.
This means that you can even keep using this led until car can’t be work.
*low electricity consumption:led is low voltage device under the condition of same work status.moreover along with this led technological development,it would be highly luminous efficiency.
*flexibility and cost-effective.the led has high cost performance,wide application scope.the more accessibly of light adjusting,easy to form a unified tone and color
contrast make user feel elegant, peaceful, tactful, suitable for expression of the soft content and poetic mood. led are highly flexible in led design work.
*firendly environment: The High power LED light source is in pure solid state wthout harmful substances such as mercury and lead, healthy and environmentally-friendly.
substances dangerous to human health.

LED chip

It’s time to use a led chip for your led project. So I think further research led chip is warranted.the led shape can be divided into two categories: circuit and square. where circuit is low price and low grane. their performance was also not stable enough.clearly www.ledlightmake .com will not adopt this led chip.

The square led chip performance is evaluated mainly with the chip size measurement.for example 12 mil(1 mil = 0.0254 square millimeter)general speak that : The bigger size is more bright in same brand . we are the most commonly used 9~12mil(using for red light led and yellow light led) and 12~14mil (using for white light led , blue light led and green light led).they are most commonly used led chip in led market.If you’re replacing small size with a larger size to handle the led design, Sure, you are able to get the more high bright for led. but we should know that larger size (bright)mean a higher price.I think that’s why so many led engineer not choose big size led chip.