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Physical properties of light

Physical properties of light

(Summary description)The amount of light passing per unit time, in lumens (lm)
Luminous flux Φ lm (lumens) The amount of light passing through a unit time.

Physical properties of light

(Summary description)The amount of light passing per unit time, in lumens (lm)
Luminous flux Φ lm (lumens) The amount of light passing through a unit time.

Information

Luminous flux
The amount of light passing per unit time, in lumens (lm)
Luminous flux Φ lm (lumens) The amount of light passing through a unit time.

light intensity
The luminous flux emitted by the light source and contained in a unit solid angle in a given direction, in units of ridges, cd.

Light intensity I=Φ/Ω(cd candela) Ω solid angle
Brightness L=I/(S.COSθ)cd /m2
Illuminance E=Φ/S Illumination measurement: 85cm on the ground when standing, 40cm in sitting posture

brightness
Refers to the ratio of the luminous intensity of the light-emitting surface in the specified direction to the projected area of the light-emitting surface on a plane perpendicular to the direction taken, in units (cd/m2).

Illuminance
Illuminance is the luminous flux per unit area of the illuminated surface, in lux (lx).

Light efficiency coefficient of light source
The luminous flux that the light source (lamp) can produce when consuming 1W of power, the unit is lm/W.

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