What is the international standard brightness value of table lamps

The standard for choosing the brightness of lamps is 70-80lm per watt, and the illuminance needs to be about 150lx, which is about 4-5W flat with conventional LED lamps.

When exactly did the lamp and the word lamp originate? In the Western Zhou Dynasty, "candle" is a kind of torch made of flammable materials, which is used to hold a torch that has been lit, called a candle; The piles of fine grass and branches that are placed on the ground to be lit are called fires, and those that are placed outside the door are called candles, and those that are inside the door are called court fires.

The earliest existing torches and lamps in China came from the Warring States period, and there is a record of "blue paste bright candles, Hua stirrups are wrong" in "Chu Ci Soul Conjuring", indicating that the name "stirrup" has appeared in the Warring States period. In the Zhou Dynasty, "stirrups" and "Deng" were universal, "Erya Shiqi": "Pigeon beans are called beans, bamboo beans are called beans, and tile beans are called Deng."

Xu Xuan said: Don't make a lamp today, no, Jin Guo Puyun: Ritual also.

The ancients called "stirrup" a lamp, which should be a pretense for the meaning of the word. Beans are a kind of cooking utensils in the Shang and Zhou dynasties, which were used to hold pickles, meat sauces, etc., and are also ancient ritual vessels, mostly made of bronze and terracotta.

The pottery bean is the earliest lamp that can be seen, in the tombs of the Warring States period, you can see a kind of thin pottery bean with a wick that can be inserted at the bottom of the plate, it is the lighting appliance at that time, and it is also one of the main forms of ancient lamps and lanterns in China.

1. The illumination value of the general table lamp reaches 300-500lx, which is up to the standard of the next ant to the national A, and it is not good if the illumination is too high.

2. The illumination is too high, regardless of the desktop and the surrounding environment, how the sitting posture of the person is opened, it will affect the brightness of the canopy felt by the human eye, and the brightness is also required, generally requiring a normal sitting posture of 2000cd per square meter. Therefore, in the case of no actual measurement, it is generally recommended that the brightness reach about 300-500, and the illuminance value is too high to see whether the eyes are comfortable, and the data to see whether it exceeds the standard.

1. The brightness of the table lamp is in the range of 25-40 degrees is better for the eyes, the incandescent lamp in this brightness range is also known as the eye-protecting desk lamp, in addition to the brightness, the color temperature of the lamp is also very important, the suitable color temperature in reading and learning is 4000k, the light of this color temperature is very soft, not easy to dazzle, and the color will not be too warm to cause a sense of sleep.

2. The upper light sources on the market are divided into a variety of lamps, including incandescent lamps, halogen lamps, full-spectrum LED lamps, fluorescent lamps and ordinary LED lamps, and their light loss liquid sources have their own advantages and disadvantages, among which incandescent lamps and halogen lamps are relatively good, mainly reflected in the spectrum, color rendering and color content rolling temperature, close to natural light, will not hurt the eyes, and the color temperature is constant, belonging to the warm yellow light source, but in terms of light stability, LED lights are the best, and there will be no problems affecting the eyes such as strobes. <>