LED Lens Terminology
Views: Date: 2015/7/14
1.LEDs Terminology| 1.Luminous Flux | |
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Φ |
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Lm(Lumen) |
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Light source shot in total amount per second. |
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E |
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Lm/m²(Lux) |
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Illuminance means in one lighted area, the density of the luminous flux on a surface, per unit area.(Illuminance is inverse ratio to the square of distance from one illuminant. And it expresses the brightness of one place.) |
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Illuminance(E)=Luminous Flux(Φ) / Area (A) |
| 3.Luminous Intensity | |
| Symbol | I |
| Unit | Cd(Candela) |
| Description | The Luminous Flux in certain direction of light source of solid angle(Ω) |
| Formula | Luminous Intensity(I)=Luminous Flux(Φ) / Solid angle (Ω) |
| 4.Luminance | |
| Symbol | L |
| Unit | Cd/m² |
| Description |
Luminance means the luminous intensity(I) per unit of one illuminated area which light radiates or passes through in a given direction. |
| Formula | Luminance(L)=Luminous Intensity(I) / Area (A) |
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