Main indicators and parameters of LED selection

Main indicators and parameters of LED selection缩略图

1, brightness
LED light brightness is the most concerned about the topic of the user, brightness can be explained from two aspects.
Brightness L: luminous flux of the luminous body in a specific direction unit stereo angle unit area. Unit: Nitro (cd/㎡).
Luminous flux φ: the sum of the amount of light emitted by the luminous body per second. Unit: lumens (Lm), said the luminous body of how much light, the more luminescence the greater the number of lumens.
Usually LED lights are marked with luminous flux, users can judge the brightness of LED lights according to the luminous flux. The higher the luminous flux, the higher the brightness of the light.
2, wavelength
Wavelength consistent LED, the same colour. There is no LED spectrophotometer producers are difficult to produce products with pure colour.
3, colour temperature
Colour temperature is a unit of measurement to identify the colour of the light, expressed in K value. Yellow light is "3300k below", white light is "5300k above", there is a kind of intermediate colour "3300k-5300k".
4, leakage current
LED is a unidirectional conductive light emitter, if there is a reverse current, it is called leakage, leakage current is large LED, short life.
5, anti-static ability
Antistatic ability of the LED, long life, and therefore high prices. The market market many fake and shoddy products in this one do very bad, this is also expected how many years of life, greatly shortened the root cause.

Main indicators and parameters of LED selection插图

The choice of LED lamps and lanterns includes the appearance, heat dissipation, light distribution, glare, installation and so on. We do not talk about the parameters of the lamps and lanterns today, only about the light source: you really will pick a good LED light source? Light source parameters are: current, power, luminous flux, light decay, light colour, colour rendering. Our focus today is to talk about the last two, first briefly talk about the first four.

  First of all, we often say: "I want how many watts of light", this habit is the continuation of the previous traditional light source, then the light source only a few fixed wattage, basically only in those wattage inside the choice, can not be freely adjusted. And now the LED, drive current slightly change, the power immediately changed! Are you still asking for power? Beware! The same LED light source, with too much current to drive the time, the power is up, but it will cause a decline in luminous efficacy, light attenuation increase. See the chart below:

  In general, redundancy = waste, but for LED operating current, it is saving. In the case of driving current to the rated allowable maximum, reduce the driving current by 1/3, the sacrifice of luminous flux is very limited. Yet the benefits are enormous:

  Light attenuation is greatly slowed;

  Lifetime substantially extended;

  Significant improvement in reliability;

  Higher power utilisation.

  Therefore, a good LED light source, drive current should be used about 70% of the maximum rated current.

  In this case, the designer should directly request the luminous flux, as for what wattage to use, should be decided by the manufacturer itself. This will promote the manufacturers to pursue efficiency and stability, rather than just go to push up the wattage of the light source, at the expense of efficiency and longevity.

  The above mentioned includes these parameters: current, power, luminous flux, light decay. There is a close correlation between them, the use of attention: which is what you really need?

  Light colour

  Traditional light source era, when it comes to colour temperature, we only care about "yellow light, white light", not too concerned about the problem of light colour deviation. Anyway, the traditional light source colour temperature on those kinds of, choose one on the line, generally will not run off where. To the LED era, we found that: LED light colour of any kind. Even with the same batch of lamp beads, there may be deviations to a thousand strange, red, green and green lively ~~~

  They say LED is good, energy saving and environmental protection. But you make it? LED to do a bad business really quite a lot! The following is a large project sent by a V friend of a famous domestic brand of LED lamps and lanterns application scene, look at the people of this light distribution, the colour temperature consistency, the ghost of blue light ……

  In view of this mess, there is a conscientious LED lamps and lanterns factory to the customer commitment: "Our lamps and lanterns, colour temperature deviation ± 150K within! , there are also design companies to do product selection, specifications on the note: "lamp bead colour temperature requirement deviation ± 150K or less".

  The basis of this 150K is cited in the traditional literature concluded that: "the colour temperature deviation ± 150K or less, the human eye is difficult to detect". They think: the provisions of the colour temperature "± 150K or less", you can avoid the occurrence of red and green things. In fact, really "not so simple" ……

Lamp beads, drivers, housing, size, luminous flux, a few metres of illumination, rated power, actual power, power factor, colour rendering index, colour temperature, ambient temperature and light failure.
Main parameters of led lamp beads:
Small power lamp beads: red and yellow: 1.8-2.4V. blue green and white: 3-3.6V. rated current are 20mA.
High-power lamp beads: 1 watt: 3-3.6V, 350 mA.

1, LED with the aspect of very square, can be used in lighting, and indicator, decoration and so on.
2, LED lamp current is DC, LED lamp voltage is not the same, each has its own voltage, such as white light, green light, blue light, are in the 3-3.5V, its normal luminous brightness is 20MM on it, you use 9V voltage plus light up, then, with {(9 - lamp voltage) / 0.02A (mA to A) = to connect the resistor, connected to the 12V is also the same.
3, red light voltage is 1.8-2.1V wavelength 610-620
Green light voltage is 3.0-3.5V wavelength 520-530
Blue light voltage is 3.0-3.5V wavelength 460-470
White light voltage is 3.0-3.5V no wavelength

Although some factories, power plants and other enterprises and institutions have not used LED lights for industrial lighting, but for LED lights, I believe that you will not have heard of the arrival of the LED lighting era, incandescent lamps and energy-saving lamps will be eliminated, which is the inevitable result of technological progress.

  LED lights and traditional lights in the performance is a big difference, especially industrial lighting led lights. So users in the procurement of how to choose a good, suitable for industrial lighting LED lights, the following industrial lighting LED lights on several parameters for a brief introduction.

Main indicators and parameters of LED selection插图2

  1, brightness

  LED lamp brightness is the user's most concerned about the problem, brightness can be explained from two aspects.

  Brightness L: luminous flux of the luminous body in a specific direction unit stereo angle unit area. Unit: Nitrode (cd/㎡).

  Luminous flux φ: the sum of the amount of light emitted by the luminous body per second. Unit: lumens (Lm), said the luminous body of how much light, the more luminescence the greater the number of lumens.

  Usually LED lights are marked with luminous flux, users can judge the brightness of LED lights according to the luminous flux. The higher the luminous flux, the higher the brightness of the light.

  2, wavelength

  Wavelength consistent LED, the same colour. No LED spectrophotometer manufacturers are difficult to produce products with pure colour.

  3、Colour temperature

  Colour temperature is a unit of measurement to identify the colour of the light, expressed in K value. Yellow light is "3300k below", white light is "5300k above", there is a kind of intermediate colour "3300k-5300k". Of course, the user can choose the appropriate colour temperature according to the lighting application environment and operator needs.

  4, leakage current

  LED is a unidirectional conductive light emitter, if there is a reverse current, it is called leakage, leakage current is large LED, short life.

  5, anti-static ability

  Anti-static ability of the LED, long life, and therefore high prices. Many fake and shoddy products on the market do a very bad job on this one, which is expected to be how many years of life, the root cause of the greatly shortened.

  6, life expectancy

  The key to different qualities is the life expectancy, life expectancy is determined by the light decay. Small light decay, long life, the real quality of the LED lights have been done almost no light decay, which is the industry's top level, the industry's vast majority of LED light manufacturers can not reach.

  7, design

  Each product will have a different design, different design for different purposes, the reliability of the LED lamp design aspects include: electrical safety, fire safety, applicable environmental safety, mechanical safety, health safety, safe use of time and other factors.

  8、Protection level

  IP is the abbreviation of Ingress, Protection, IP rating is for the electrical equipment shell of foreign body intrusion protection level, such as: explosion-proof appliances, waterproof and dust-proof appliances, the source of the International Electrotechnical Commission's standard IEC60529.

  The protection level is mostly expressed as IP followed by two numbers, which are used to specify the level of protection. The first number indicates the extent to which the equipment is resistant to fine dust, or the degree to which people are protected from hazards in a sealed environment. This represents the level of protection against the ingress of solid foreign objects, with the highest level being 6. The second number indicates the extent to which the device is waterproof. It represents the level of protection against water ingress, with the highest level being 8.

  Of course, the parameters of LED lights are more than these, such as strobe, heat dissipation, light efficiency, etc. are relevant parameters to judge the quality of LED lights.

  Users should understand that the choice of LED lamps can not be like choosing incandescent lamps only look at the wattage, LED lamp wattage has been unable to accurately interpret the brightness of the LED lamps, high luminous efficacy of the low wattage may also be brighter than the high wattage of the LED lamps. This is the LED era, only with the appropriate parameters to choose a good quality of industrial lighting LED lights. Feel free to ask questions about recolux LED lighting equipment!

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