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Lighting Terms and Definitions-TJ2 Lighting

Lighting Terms and Definition-TJ2 Lighting, LED Lighting Manufacturer in Taiwan, led lighting company, led lighting suppliers, led lighting manufacturers, led lights, taiwan led lights

As a professional led lighting manufacturer, we have compiled the lighting terms below which contain accessible definitions of the terms that are widely used in the lighting industry. The descriptions of the terms and acronyms represent the meanings expressed by a majority of the lighting field.

Lighting Terms

Luminous flux(Lumen, lm, Φ)

The total amount of light emitted by a light source in a unit of time.

lumen meaning, Lighting Terms and Definitions, TJ2 Lighting, LED Lighting Manufacturer in Taiwan, led lighting company, led lighting suppliers, led lighting manufacturers, led lights, taiwan led lights

Luminous Intensity (candela, cd)

Luminous intensity (Iv), which is the luminous flux (dΦ) emitted by the light source in a solid angle (d Ω) from the specified direction.

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Illuminance(Lux ,lx )

The brightness of the light falling on a certain area illuminated by the light source. Illuminance is the ratio of luminous flux to the area of the illuminated surface.

Illuminance(Lux)=The amount of lumen falling on the certain area(lm)/The certain area(m^2)

Illuminance, Lighting Terms and Definition- TJ2 Lighting-LED Lighting Manufacturer in Taiwan, led lighting company, led lighting suppliers, led lighting manufacturers

Luminance(nit )

The intensity of light emitted or reflected from an object seen from a certain direction. It indicates the intensity of light emitted or reflected from a certain area of an object.

It can be expressed as how bright it looks in a unit area.

Luminance(Lv)=Luminous Intensity(cd)/Area of illuminated surface(m^2)

Luminance, Lighting Terms and Definition- TJ2 Lighting-LED Lighting Manufacturer in Taiwan, led lighting company, led lighting suppliers, led lighting manufacturers

Luminous efficacy(lm/W)

It represents the efficiency of the light source in converting the consumed electrical energy into light, and the higher the value, the higher the conversion efficiency of the light source.

Luminous efficacy (η) lm/w= Luminous flux produced (lm)/Electrical power consumed (W)

Luminous efficacy, Lighting Terms and Definition-TJ2 Lighting-LED Lighting Manufacturer in Taiwan, led lighting company, led lighting suppliers, led lighting manufacturers

Beamangle(Degree, D)

The angle between the two directions for which the intensity is 50% of the maximum intensity as measured in a plane through the centerline.

For example, the central light intensity of a certain source is 1000 cd light, and the angle between 1000~500 cd is the beam angle of the light source.

beamangle, Lighting Terms and Definition -TJ2 Lighting-LED Lighting Manufacturer in Taiwan, led lighting company, led lighting suppliers, led lighting manufacturers

Color Rendering Index(CRI , Ra)

Percentage of color fidelity of an object perceived in natural light versus other light, where natural light sources like the sun have a wonderful index of 100.

 All lists of CRI Rcolors are as follows:

Average color rendering index (Ra):
It is the average value of R1~R8, which is generally referred to as the color rendering index.

Other color rendering index:
Strong Red (R9), Strong Yellow (R10), Strong Green (R11), Strong Blue (R12), Light yellowish pink (R13), Moderate olive green (R14), Asian Skin Color (R15)

CRI-Color rendering index (R1-R14), Lighting Terms and Definition-TJ2 Lighting, LED Lighting Manufacturer in Taiwan. led lighting company, led lighting suppliers, led lighting manufacturers, taiwan led lights

Color Temperature

A measurement of how warm or cold a light source presents. The color temperature is expressed in Kelvin (K) and the lower the kelvin number, the warmer the light.

Color Temperature, Lighting Terms and Definition-TJ2 Lighting, LED Lighting Manufacturer in Taiwan, led lighting company, led lighting suppliers, led lighting manufacturers, led lights, taiwan led lights

Glare

Visual discomfort caused by a bright source of light

The presence of an extremely bright light source in the field of vision causes visual discomfort.

  • Direct Glare: A harsh glare perceived when looking directly at a light source.
  • Reflected Glare: Caused by the reflected light from the surface of the object in your sight.
  • Background glare: Excessive light emitted from the background light source affects the vision.

More Information: Glare-Lighting Terms And Definitions

Three types of glare-Direct Glare,Reflected Glare, Background glare, lighting terms and definitions-TJ2 Lighting, LED Lighting Manufacturer in Taiwan, led lighting company, led lighting suppliers, led lighting manufacturers, led lights, taiwan led lights

Flicker

A light blinks repeatedly caused by power supply problems or a faulty driver.

Some research indicates it might cause headaches, fatigue, blurred vision, diminished vision, and other discomforts.

More Information: Flicker-Lighting Terms And Definitions

Effect of Flicker Frequency TJ2 Lighting LED Lighting Manufacturer in Taiwan

Direct Light Vs. Indirect Light

Direct light is when the light from a fixture or lamp illuminates or shines on a specific area or an object.

Indirect light, besides, is usually used to illuminate a wide space. According to such light, the light diffuses instead of concentrating on the specific area. Thus, the indirect light creates soft and smooth lighting to the entire space.

More Information: Direct Light Vs. Indirect Light-Lighting terms

Direct Light Vs. Indirect Light, direct lighting definition-Lighting terms-TJ2 Lighting-LED Lighting Manufacturer in Taiwan, led lighting company, led lighting suppliers, led lighting manufacturers

General, Accent And Functional Lighting

General lighting, also referred to as ambient lighting, means to illuminate equally, non-specific and provide the necessary brightness to an area with appropriate light fixtures.

Accent lighting focuses light on a particular area or object. It focuses on highlighting specific objects, architectural features, or areas within a space to create visual interest and emphasis.

Functional lighting, also known as task lighting, refers to the type of lighting that is designed and positioned to provide adequate illumination for specific tasks or activities.

More Information: General, Accent And Functional Lighting

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IP Ratings

IP stands for “Ingress Protection,” and the IP rating of a lighting fixture indicates its level of protection against intrusion from solids and liquids. The rating is composed of two digits: the first one signifies protection against solids, while the second denotes protection against liquids.

Note: IEC 60529 has been developed to rate and grade the resistance of enclosures of electric and electronic devices against the intrusion of dust and liquids.

The first digit in an IP rating ranges from 0 to 6, indicating the level of protection against Solid Foreign Objects. The second digit in an IP rating ranges from 0 to 8, indicating the level of protection against liquids.

More Information: Discover IP Ratings In LED Lighting For Your Home


Dimmable Lights and Tunable Lights

Dimmable lights have been a staple in households for decades, providing a simple yet effective means of adjusting the brightness levels of a room. 

Tunable lights, on the other hand, represent a more advanced and dynamic approach to lighting control. Unlike traditional dimmable lights, tunable lights allow users to not only adjust the brightness but also control the color temperature of the light.

More Information: Illuminating Choices: Dimmable Lights Vs. Tunable Lights

Dimmable Lights vs. Tunable Lights- TJ2 Lighting, LED Lighting Manufacturer in Taiwan, led lighting company, led lighting suppliers, led lighting manufacturers, led lights, taiwan led lights

Triac Dimmer, LED 0-10v Dimming, PWM Dimming

Triac Dimmer

All phase-cutting dimmers work by switching the AC mains supply to the LED lamp on and off twice in every mains cycle. This has the effect of reducing the flow of electrical energy to the LED lamp or fixture, so reducing its light output.

There are two types of phase-cutting dimmers:

  • Leading edge phase-cutting dimmers (also known as triac dimmers and rising edge dimmers). These work by switching the current off at the zero-crossing point (see diagram) and on again later in the same mains cycle. The amount of energy flowing to the LEDs depends on the duration of the “off” period. The longer the off period the dimmer the LEDs will appear to be.
  • Trailing edge phase-cutting dimmers. These work by switching the current on at the zero crossing point (see diagram) and off later in the mains cycle. Usually, this is done with an electronic component called an isolated gate bipolar transistor (IGBT). The amount of energy flowing to the LEDs depends on the duration of the “off” period. The longer the off period the dimmer the LEDs will appear to be.

LED 0-10v Dimming

0-10V LED dimmer uses the DC voltage to control the output of the light fixture. This is one of the most straightforward and earliest lighting control systems. 0-10V dimming allows the smooth operation of light and dimming at the light levels of 10%, 1%, and 0.1%.

This system connects to your LED fixture, which allows you to choose the right light level based on your needs at the moment. For example, at 8V then the light fixture is at 80% output. If the signal is brought down to 0V, the light is at the minimum dim level, which could vary from 10% to 5% to 1%.

PWM Dimming

PWM dimming achieves the same effect by varying the duty cycle of a constant current in the string to effectively change the average current in the string.  The two key parameters in PWM dimming are the duty cycle and frequency:

The duty cycle is defined as the ratio of the amount of time the signal remains high to the total time of the cycle. It is expressed as a percentage and determines the illuminating level of a light source. A higher duty cycle results in a brighter light, while a lower duty cycle results in a lower illumination. For example, if the signal is constantly on, it is a 100% duty cycle.

The pulse width modulation (PWM) signal frequency is another crucial element. The PWM frequency determines how quickly a period—the amount of time it takes for the signal to turn on and off.

What are the Triac Dimmer, LED 0-10v Dimming, PWM Dimming? TJ2 Lighting, LED Lighting Manufacturer in Taiwan, led lighting company, led lighting suppliers, led lighting manufacturers, led lights, taiwan led lights

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