The parameters that determine the light intensity are

The parameters that determine the light intensity are: first, the illuminance unit (lux), second, the luminous flux unit (lumen), and third, the luminous intensity unit (candle). Here is a brief introduction:

1. Candlelight: 1CD refers to the luminous intensity of a completely radiated object per sixtieth square centimeter at the freezing point of platinum. (In the past, it refers to a whale oil candle with a diameter of 2.2 cm and a mass of 75.5 g, which burns 7.78 g per hour, the flame height is 4.5 cm, and the luminous intensity along the horizontal direction). The active luminous body generally adopts the luminous intensity unit candle CD, such as incandescent lamp and LED.

Lumens: 1L refers to the luminous flux of 1 CD candle shining on a plane with a distance of 1cm and an area of 1cm. Reflecting or penetrating objects use luminous flux unit lumen L, such as liquid crystal projector;

3.Lux: 1Lux refers to the illuminance that the luminous flux of 1L is evenly distributed on the area of 1m2. Luminance unit Lux is generally used in photography and other fields.

These three light intensity units can be considered to be equivalent in value, but they need to be understood from different angles.