LED rendering index level(LED Ra)

Question one :what is rendering index for led chip? when led light fall on certain thing it represents the ability of rendering , we ‘ll call it ”rendering index” rendering index is import condition for evaluation of led quality . also is import method for evaluation of led source color rendering . which is widely applied right now . the higher the rendering index, the better the rendering . we can used the evaluation criteria to description the rending level:
Ra value < 50 as “bad”
Ra value >50 and <70 as “general”
Ra value >70 and <80 as “good”
Ra value >80 as “excellent”

At present , the led source of www.ledlightmake.com’ led can up to Ra≥97, can accept this personalized customization

LED infuse gum

LED can be used in the room displays , as well as the outside. it’s good value to consider led a proof water .there are has two kind of way to proof water.
1、assembly sleeve：first Select socket and spigot type. then put the led strip into sleeve final the two ends of sleeve are sealed.
2、infuse gum：led worker was given in was given on led strip.

let’s now discuss the simply of infuse gum process:

1、    Clean the surface of LED: clean the surface of led strip with friendship environment plate washer water .

2、    Put the led to infuse gum fixture: place the led strip on a flat fixture.

3、    Ruing the infuse gum machine: turn on infuse gum machine prepare to infuse gum. in here we should note that exhaust hole of infuse gum machine . Vents are formed on the edge of the depression of the plastic rubber body, which can play the ventilating function during the rubber injecting operation.

4、    dry by the fire :put the led strip in the oven and let them roast for six ~ eight hours.  or dry naturally for twenty hour after infuse gum .

analysis of led short-circuit
There are some situation for led short-circuit.
overheating: most led damage is mainly caused by heat. short-time lasting overheating resulted from continuous heat.
* instantaneous big current: the led short-circuit at the starting instant of input big current might be seriously jeopardize its service life.
* In other case of led breakdown , then forming short-circuit, final the gold wire of led blew out and formed circuit breaker.
Let’s illustrate this test with Oscilloscope picture：

led circuit breaker before short-circuit

led short circuit in direct

led circuit breaker in direct

led short –circuit before circuit breaker

led power

Let’s remember the definition of the law of conservation of energy. The change in potential energy is going to be the change in kinetic energy You have conservation of energy principles. the nation law ,we can’t break it. also include led power, now we used led as an example .if all energy(led power)put into led , the electrical energy will be charge to power(P) when led is working, the electrical energy converts two kinds of electrical energy — a energy for lighting(we call optical PV) and other energy for heat(we call thermal power PH).
We were at the front, show a different distribution pattern for led power.Next, let’s look at the formula for led power.

LED Lighting Luminaire’s Photometric vocabulary
* basically parameters
luminaire lumens
effective luminous flux
luminaire efficiency
central intensity
maximum intensity
angle of maximum intensity
beam angle
intensity data distribution
iso illumiance

*indoor lighting parameters
basically parameters
up flux rate
down flux rate
maximum s/h
luminance limit curve
utilization factor table of indoor
budgetary estimate table

*spot led light parameters
basically parameters
half peak side angle
type B intensity data
zonal flux distribution table
space iso intensity curve

*road led light parameters
basically parameters
maximum s/h
up flux rate of stree
up flux rate of house
down flux rate of stree
down flux rate of house
zonal flux
iso candela diagram on circular web
coefficicen utilization curve

The uv led advantage is very obvious, if we compare with traditional ultraviolet lamp and uv led strip. as we will show some advantage of ultraviolet led production.

1)、ultraviolet led is cool light source ,without heat radiation . other words : it can’t produces heat when working . and thus creation of better work environment for other device.

2)、high efficiency; light energy of ultraviolet led centre upon one specific wavelength(ultraviolet spectral band) . although the traditional ultraviolet looks so bright ,  but it has a wide ultraviolet spectral band. only small number of valid ultraviolet spectral band devote to work as well . so the efficiency is so low.

3)、long service time; ultraviolet led has long service-time, the valid service time can meet to 20000-40000 hours .

4)、high staring speed; the ultraviolet has quick starting speed and reliable running.

5)、electricity consumption low; much less electricity than traditional ultraviolet lamp and last much longer.

6)、more environmental protection ;without mercury and it produces absolutely no ozone.

UV LED electronics character
UV led strip is currently controls device , the load character are like that curve chart of PN junction .you can get a view that it flow past from here in chart. even a very small change in the forward voltage for forward currently can have a very big impact. reverse current is small, and reverse voltage did exist. the consummation divided into two sections: a portion of energy transform to light , and other portion of energy turns into heat energy .

Did PWM affect LED service time?

The PWM(pulse width modules ) is one of the primary regulate light way. it is only not easy to achieve , it is import thing that user can control currently of led. but also have a lot user worried about it’s hurt to led . That is impossible, i know you don’t believe me, but I can prove it to you. please see information as follows:

To obtain the prerequisite, the big junction temperature(Overlarge heat stress may destroy the led  service time) is necessary and high frequency of led PWM 。on the contrary, the led e layer to form a larger thermal stress; layer to form a larger thermal stress,
you may rest assured use it in adjusted light circuit.

ultraviolet led and ultraviolet lamp

The ultraviolet has an advantages than ultraviolet lamp .the most import point that ultraviolet is cold led resource . and it not have thermal radiation . can effectively solve the problem in traditional hot injured .the ultraviolet is particularly well suited for Liquid crystal edge printing and film printing . and the ultraviolet led source send out ultraviolet ray by what is a high-purity and single wavelength ultraviolet light source. there is absolutely no radiates any infrared light . so the ultraviolet was real cold light source .

Wavelength Pluse and Wavelength Dominant
Wavelength Pluse and Wavelength Dominant that’s the big difference.Before you know it, we should have come to know WL. what is WL? WL is “WL” is the abbreviation of “Wavelength”

Wavelength Pluse mean the most strong radiation power correspond to wavelength on Luminescence Spectra.

Wavelength Dominant was the strongest predictor wavelength of human eye on Luminescence Spectra.