How many lumens is the light intensity of the sun equivalent to at noon? How many lumens of LED should be used if LED is used to simulate the sun to illuminate solar cells?

Bright sunlight provides illumination on the earth's surface of about per square meter 100000 lumens or 100000 lux.

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

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-.

This kind of experiment can't use LED to simulate sunlight to irradiate solar cells. Solar radiation is a kind of thermal radiation, and the light is very complicated. For solar cells, from infrared region to ultraviolet region, it has played a more or less positive or negative role. At present, LED generally uses mixed white light generated by phosphor excitation. Basically a cold light source. Therefore, it cannot be used to simulate the sun, and xenon lamps are generally used to do such experiments.

Extended data:

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 natural lighting, sunshine time is generally calculated (Ming period).

In artificial lighting, 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 the distance between points in a square foot 1 candlelight source 1 the amount of light in an area of a foot is 1 lumen).

Baidu encyclopedia-light intensity

Baidu encyclopedia-sunshine