ABOUT LEDs PDF Печать E-mail
Автор SHENZHEN WATT AUTO ELECTRICAL CO.,LTD   
1.LED (light-emitting diode)
A PN junction device that gives off light radiation when biased in the forward direction.
2.Luminous flux Unit: Lumen, lm
Defined as the total luminous energy per unit time emitted by the light source into a sphere(360°)surrounding the light source, where the luminous flux multiplied by the human eyes sensitivity. The measurement unit for luminous flux is the lumen (lm).

Пример изображения

·ABOUT LEDs

1.LED (light-emitting diode)
A PN junction device that gives off light radiation when biased in the forward direction.
2.Luminous flux
Unit: Lumen, lm
Defined as the total luminous energy per unit time emitted by the light source into a sphere(360°)surrounding the light source, where the luminous flux multiplied by the human eyes sensitivity. The measurement unit for luminous flux is the lumen (lm).

3.Luminous Intensity (lv)
Unit: candela, cd
The amount of luminous flux emitted into a very small solid angle at a defined angular orientation from the light source. The unit of luminous intensity is the lumen/steradian (lm/sr), or candela (cd). Generally, light source will emit its luminous flux at different of direction of different luminous intensity.
Luminous intensity is the visible light, which emit at a defined angular orientation.

4.Illuminance, E
Unit: Lux, 1x
The ratio of luminous flux and emitted area.1 LUX's illuminamce is the luminous flux indicate on a unit area symmetrically.

5.Light and radiation
The light is mean the human eyes can sense the bright electromagnetic radiation. The human visual range is typically from 360nm to 830nm.

6.Luminance (LV)
Unit:cd/㎡
Luminous flux per unit solid angle per area of emitting surface at an angle with respect to surface normal, in candela per square meter or nits.
Important formulae of light measurement:
I: luminous intensity﹤cd﹥=total light energy in tridimensional angel/tridimensional angle Ω﹤sr﹥
E:Illuminance ﹤lx﹥=the luminous flux indicate on a unit area symmetrically ﹤lm﹥,unit area of emitting surface﹤㎡﹥=Luminous intensity﹤cd﹥﹤distance﹥﹤㎡﹥
IV:Luminance ﹤cd/㎡﹥=Luminous intensity﹤cd﹥/Unit area of emitting surface of sight﹤㎡﹥
:Luminous Efficacy﹤lm/w﹥=total output of luminous flux﹤lm﹥dissipated wattage﹤㎡﹥

7.Luminous Efficacy
Unit: lm/W
The light output of a light source divided by the total power input to that source. It is expressed in lumens per watt.

8.Color Temperature
The concept of color temperature is based on the relationship between the temperature and radiation emitted by a theoretical standardized material, termed a black body radiator cooled down to a state in which all molecular motion has ceased.

9.Light Color
A measure of the color appearance of a light source which helps describe the apparent “warmth”(reddish) or “coolness”(bluish) of that light source. Generally, light sources below 3200K are considered “warm;” while those above 4000K are considered “cool” light sources. The color temperature of a lamp has nothing to do with how hot the lamp will get or how much heat will be given off by the lamp.
The most typical Kelvin degree lamps used in lighting are as follows:

 

Kelvin

 Associated Effects & Moods

 Appropriate Applications

2700 °

 Friendly, Personall, Intimate

 Homes, Libraries, Restaurants

3500 °

 Friendly, Inviting, Non-threatening

 New Offices, Public Reception areas

4100 °

 Neat, Clean, Efficient

 Older offices, Classrooms, Mass Merchandisers

5000 °

 Bright, Alert, Exacting Coloration

 Graphics, Jewelry Stores, Medical Exam Areas

 

In the LED area, we usually describe the white light which below 5000K as the incandescent light source, 5000-8000K as the warm light source, above 8000K as the cool light source. The scale ranges from 1(low pressure sodium) to 100(the sun). The higher the CR (based upon a 0-100scale), the better colors appear.

10.Color Rendering Index (CRI)
A measure of a lamp's ability to render colors accurately. The scale ranges from 1(low pressure sodium) to 100(the sun). The higher the CR (based upon a 0-100 scale), the better colors appear. A CRI of 80 is considered to be very good.

11.Wattage
Wattage is the amount of electrical power consumed by a lamp or light fixture measured in “watts”. One watt is equal to the power dissipated by 1 ampere of electrical current flowing across a resistance of 1 ohm or the power produced by 1 ampere of electrical current under an electromotive force of 1 volt. One horsepower is equal to 746 watts.Formulae:watts=volts×amps,P=V×1,electrical power=electromotive force×electric current.

12.Integrating sphere
A hollow sphere coated internally with a white diffusing material and provided with openings for incident beam, specimen and detector used for measuring the diffuse reflectance or transmittance of objects.

13.Luminaire Efficiency
The ratio of total lumens emitted by a luminaire to those emitted by the lamp or lamps used.

14.Incandescent lamp
A light source which generates light using a thin filament wire (usually tungsten) heated to white heat by an electric current passing through it.

15.Spectruum
Line spectra was distributed according to the wavelength from big to small. The spectrum of sun light and incandescent solids are said to be continuous because all wavelengths are present. The spectrum of incandescent gases, on the other hand, is called a line or emission spectrum because only a few wavelengths are emitted. These wavelengths appear to be a series of parallel lines because a slit is used as the light-imaging device.

 
·ABOUT AUTOMOBILE LED LAMPS

Which Color LEDs should I use?
For best results the LED color should be the same as the lens color. As an example: a red lens will filter out all but the red portion of the light so if the light is all red, none or very little light will be blocked by the lens. The light from a White LED contains very little light in the red portion of the visible spectrum so most of the light would be filtered out by a red lens.

Turn signal issues with LED bulbs

LED brake/tail lamps will not flash with thermal flasher units due to their extremely low current draw. These installations will require an electronic flasher unit, available in car bulb shopping (for some vehicles) or at your auto parts store. Try to find flashers designed to work with LED bulbs; they will say "LED compatible". Often HEAVY DUTY flashers will also work with LED bulbs.

Another fix is the installation of Load Resistors, which are wired across (in parallel with) the turn signal bulbs to simulate the load of a standard filament bulb.

Dash indicators reporting burnt out bulbs

LED bulbs may cause some newer vehicles to indicate a bulb is burnt out (because of their low power consumption). Some cars indicate this by increasing the flash rate of the turn signals, some turn on a bad bulb indicator. The only fix for this is to install Load Resistors across the bulbs that are being indicated as bad. Some vehicles will also disable the cruise control system if a brake light bulb is being indicated as bad, the installation of Load Resistors will also solve this problem.

Brightness of LED Car Bulbs

LED bulbs are generally not as bright as standard incandescent bulbs, they have many advantages over filament bulbs (longer life, faster on/off times, lower power consumption, more vivid colors) but brightness is not one of them.
They are generally not as bright but some of them with large numbers of LEDs will appear brighter than filament bulbs.

The light is distributed differently so they can appear brighter in some applications and not as bright in others; it depends on the size and shape of the bulb housing and reflector.
Most LED bulbs emit light like a flashlight, all out the end. Regular filament bulbs emit light from the end and all sides, so they will be better suited for some lighting applications than LED bulbs.
This is the same reason why we do not rate LED car bulbs in lumens or watts, they would be a deceptively low numbers because the light is measured from all sides and the end on standard filament bulbs but only from the end on LED bulbs

Which LEDs bulbs are brightest?

More LED the bulbs with; brighter it will be,

T25 19LEDs are brighter than T25-12LEDs,

But more LEDs, it will be more expensive, so please select the matching to your car with the right LED quantity and cost.

Are your bulbs standard size?
All of our Tail/Brake lights are the standard one-inch diameter

What is the difference between Narrow and wide viewing angle?
Some of our bulbs are available with Narrow or Wide viewing angle. The Wide angle (approx. 100 degree beam) will light up more area but dimmer than the Narrow angle. The Narrow angle (approx. 15 degree) will illuminate a smaller area but brighter than the Wide angle. We also offer bulbs with some LEDs aiming out the end of the bulb and some radically mounted LEDs aiming out the sides of the bulb. These will provide a more complete and even light pattern on the vehicle lens.
We cannot recommend which type would work best in your vehicle because it depends on the size, shape and depth of your bulb housings. The Wide-angle bulbs usually work best for most vehicles.

How do your LED bulbs achieve dual intensity?

All of our Tail/Brake bulbs achieve dual intensity modes by turning all of the LEDs on dim or all of the LEDs on bright; all of the LEDs are always lit when either mode is active.

If I install LED bulbs in the dash, will the dimmer still work?

Yes, LED bulbs will dim with your dash light intensity control

Warranty Information

Do not use LED bulbs in the same housing with headlamps, the heat will cause them to fail quickly and void the warranty, guaranteed the lamp's working temperature: -40o~100o.

Some GM vehicles apply a pulsed voltage to the Day Time Running lights (DTR), this pulsed voltage causes LED bulbs to fail quickly, just as the stock filament bulbs also fail quickly in these DTR installations.

 
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Лампы светодиодные (LED) полный каталог
VIRIBRIGHT производитель светодиодных ламп премиум качества
CIVILIGHT - производитель светодиодных ламп
MAXUS - светодиодные лампы
ELECTRUM светодиодные лампы
LED модули SMD3528 & SMD5050
Светодиодные прожекторы
Светодиодные профили на LED 5630: 1,5m;1,2m; 0.9m; 0,6m
LED линейки по 0.3 m SMD5050
Светодиодные кольца D60-140mm
Светодиодные авто лампы
Электронные трансформаторы для галогенок 12v
Источники питания.на 12в и 24в
Управление светом (RGB контроллеры и усилители, диммеры)
Светодиодные ленты 12-24vdc
Алюминиевый профиль для лент
СВЕТОДИОДЫ (LED)
Светодиодные драйвера (7-30 vdc/vac)
Светодиодные драйвера с входным напряжением ~220В
Конденсаторы электролитические
Конденсаторы керамические
SMD индуктивность
SMD тантал
Конденсаторы пленочные
Микросхемы
Транзисторы
Симисторы
Тиристоры
Стабилизаторы напряжения
Диоды
Диодные мосты
Стабилитроны
Суппрессоры (suppressors)
Силовая электроника
Оптопары
Реле
Резисторы
Клемники винтовые
Разъемы и гнезда
Кнопки нажимные и тактовые
Варисторы
Предохранители
Панельки для микросхем
Распродажа
Мировые производители
Макетные платы
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