1 lux = how many lumens?

1 lux = 1 Lumen luminous flux is evenly distributed on the area of 1 m2. Namely: 1lux= 1lm/ m2.

Lux is the unit of illumination, and the symbol is Lux or Lux; Lumen is the international unit of luminous flux, and the symbol is lm.

Lux is the extraction unit, which is extracted in lumens (lm).

1 lux means that in the area of 1 m2, when the luminous flux of an object irradiated by light is 1 lumen, its illuminance is 1 lux.

Extended data:

A, lighting related terms:

1, natural lighting and artificial lighting

Daylight lighting is natural lighting, while light lighting is artificial lighting.

2. Lighting period and lighting time

24 hours a day is a light cycle in nature. When there is light, it is a bright period, and when there is no light, it is a dark period.

In terms of natural lighting, the sunshine time is generally calculated (Ming period); In artificial illumination, the illumination time is illumination time, and the 24-hour illumination period is natural illumination period.

Time longer or shorter than 24 hours is called unnatural lighting time; If there is only one bright period and one dark period in 24 hours, it is called single-phase illumination; If there are two or more bright periods or dark periods in 24 hours, it is intermittent illumination. The sum of the bright periods in the illumination period is the illumination time.

3. Illuminance

The amount of luminous flux transmitted by a light source within a solid angle in a certain direction. Unit: Candela (CD).

4, luminous flux

The light energy radiated by a light source in a unit time is called the luminous flux of the light source, and its unit is lumen (1 distance between points in a square foot 1 candlelight source 1 the amount of light in an area of a foot is 1 lumen).

Second, the relevant definitions of light:

Illuminance is the degree to which an object is illuminated. That is, the ratio of the luminous flux obtained on the surface of the object to the illuminated area, with the unit of lux Ix (1 lux is the illuminance generated by uniform illumination of luminous flux of 1 lumen on the area of 1 square meter) or Footcandle FC (1 Footcandle is 1 lumen with luminous flux of/kloc-.

Under direct sunlight in summer, the light intensity can reach 60000 ~ 1000 LX, outdoor without sunlight is 0. 1000 ~ 1000 LX, indoor in summer 100 ~ 550 lx, and under the full moon at night is 0.2lx

Incandescent lamps can emit about 12.56 lx per watt, but the value varies with the size of the bulb. Small bulbs can emit more lumens, while large bulbs emit less. The luminous efficiency of fluorescent lamp is 3 ~ 4 times that of incandescent lamp, and its service life is 9 times that of incandescent lamp, but its price is higher.

About 30% of the light emitted by incandescent bulbs without lampshades is absorbed by walls, ceilings and equipment. The poor quality of light bulbs and dim light will reduce many lumens, so only about 50% lumens can be used.

Generally, when there is a lampshade and the height of the lamp is 2.0~2.4m (the distance between bulbs is 1.5 times the height), you need 1W bulbs per 0.37m2 area or 2.7W bulbs per 1m2 area, which can provide the installation height of 10.76lx and the light intensity of the lampshade.

References:

Baidu encyclopedia-lux

Baidu encyclopedia-lumen