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Luminous flux
1. Definition: a light source unit of time given to space, it gives rise to the feeling of light energy.
2. Description: Luminous flux is a measure of how much of an indicator light source to φ represents.
Let the light source within t seconds in total radiated energy is W, we put out the light radiation and radiation W
Shoot ratio of elapsed time t is called luminous flux;
Because the human eye depends on the relative rates of different wavelengths of light to see different, so that different wavelengths of light radiated power
When equal, the luminous flux is not equal, the human eye to light of a wavelength of 555nm (yellow) most Min
3. Unit: lumen (lm) - Utility Unit 1 light watt light watt = 683 lumens

4. Example: Domestic consumption of 1W per incandescent energy flux generated about 12.5lm ~ 15lm;

Luminous efficiency (irradiance efficiency)
1. Definition: The ratio of electric power flux luminous efficiency, light emitted by the abbreviation and it consumes.
2. Unit: lumens / watt (lm / W)
3. Example: general incandescent luminous efficiency of about 12 ~ 15lm;
Ordinary fluorescent luminous efficiency of about 30 ~ 60lm;
High frequency fluorescent luminous efficiency of about 70 ~ 90lm;
HPS (HID) light-emitting efficiency of about 100 ~ 120lm;
The luminous efficiency of LED lamps is about 60 ~ 90lm.

Luminous intensity (irradiance intensity)
1. Definition: The space density of luminous flux, luminous flux per unit solid angle that is within.
2. Description: measure the amount of light source intensity of the extent to sign Iv representation.
3. Unit: candela (cd) luminous intensity, also known as a candle candlelight approximately 1 cd
1cd = 1000mcd

Light intensity (illuminance)
1. Definition: It is on the light side surface flux density of luminous flux per unit area by.
2. Description: is the amount of light a surface is illuminated by the degree to E represent.
3. Unit: Lux (lx) lm / m2
1 lux is equal to one lumen (lumen, lm) to light flux evenly distributed on 1m2 area
4. Example: Illumination of natural light about as follows:
100000lx sunny under direct sunlight
When 10000lx sunny shade
20lx sunny day Indoor corner
0.2lx month night
General office and living room illumination requirements 150lx ~ 300lx
The lighting illuminance required reading was 500 ~ 600Lx

Color rendering index (Ra)
1. Definition: characterization of the amount of light on the body play a color authenticity. Provisions of daylight (Incandescent) of color rendering index
The number is 100.
Color rendering (CRI): a light source for color rendering of objects called color rendering.
2. Description:
When the light source spectrum, little or lack of objects at the reference light reflected from the main wave, make Yen
Color produces clear color (color shift). The greater the degree of color, the color of the light source color worse.
Two types of color
Faithful color: to show the correct original color of material need to use a color rendering index (Ra) of high light,
Its value is close to 100, the color is best.
Color effect: To clearly emphasize specific color, showing beautiful life can add color methods
To enhance the effect of color. Low color temperature light exposure, to make red more vivid; with medium color temperature
Light source, the blue has a cool feeling; irradiation with high color temperature light source, so that the object has a cold feeling.

Light distribution curve
1. Definition: shows the distribution of a lamp or light source emits light in space.
2. Description: Record the lamp light intensity in each direction.
Classification light distribution curve:
Light distribution curve in accordance with its symmetrical nature generally be divided into: axially symmetric, asymmetric and symmetric light distribution.
Axially symmetric: also known as rotationally symmetric light distribution curve refers to all directions are substantially symmetrical
, The general downlights, mining lamps are such light distribution.
Symmetric: When the lamp C0 ° and C180 ° light distribution symmetrical cross section, while the C90 ° and C270 ° cross-section with light
Symmetrical, so light distribution curve is called symmetric light distribution
Asymmetrical: refers C0 ° - 180 ° and C90 ° - 270 ° light distribution to any one cross section asymmetric situation
Light distribution curve in accordance with its beam angle can generally be divided into:
Narrow beam: beam angle <20 °
Medium Beam: Beam angle: 20 ° ~ 40 °
Wide beam: beam angle:> 40 °
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