Science literacy: lighting LED the ten basic terminology

Φ flux symbols, unit lumens Lm, light emitted per second the sum total of the amount of light that luminous flux.

I light intensity symbols, unit candela CD, that the light in a particular direction of the luminous flux emitted within the solid Angle. E

intensity of illumination symbols, unit lux Lm/m2, to show that the light irradiation as objects the luminous flux per unit area. L

brightness symbols, the unit's CD/m2, that the light in a particular direction unit solid Angle of the luminous flux per unit area.

photosynthetic efficiency units lumens per watt Lm/w, that electric light source's ability to convert electric energy into light, with a luminous flux divided by power consumption.

life expectancy hourly, that refers to a group of light bulbs to fifty percent the number of hours of damage.

the hourly economic life, at the same time consider the light bulb damage and beam attenuation under the condition of output, the composite beam output to a specific number of hours. Used in outdoor light source was seventy percent, the proportion of indoor light sources such as fluorescent lamp is eighty percent.

the color of the TPS source emitting light color and the black body radiation at a certain temperature light color at the same time, the temperature of the blackbody is referred to as the light source color temperature. Light source color temperature is different, have different color, color temperature below 3300 k have sedate atmosphere, warm feeling; Color temperature in 3000 - Among 5000 k for color temperature, feel cool; Color temperature above 5000 k feel cold. Different sources of light color of the best environment, > 5000 k color temperature light color is cool and refreshing type ( With blue and white) Cold atmosphere effect; Color temperature - in 3300 5000 k light color for intermediate ( White) Frank atmosphere. The effect; Color temperature

color rendering of light source color rendering is showed by color rendering index, which represents the object under the light color than the benchmark light ( The light from the sun) Lighting color deviation can comprehensively reflect the light source color feature. Color is divided into two kinds of true color, can show the color of the material was right to use the color rendering index ( Ra) High light source, its value is close to 100, the best color; Effect of color, want to clearly emphasize a particular colour, show the beauty life additive method can be used to strengthen the color effect. Is different due to the spectral composition of light, as a result, even if the same light color, light color can be different.

lamps and lanterns is also called light output efficiency coefficient, is the important measure of lamps and lanterns use of energy efficiency, it is the output of light energy of lamps and lanterns and lamps and lanterns light source inside the ratio between the output of light energy.

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