Some knowledge of home lighting

For quite a long time, people’s understanding of home lighting is relatively simple. A large chandelier in the living room, a small chandelier in the dining room, and a ceiling lamp in each other room is the standard configuration. The high-level point is equipped with a reflective lamp slot, or the surrounding spotlight. This kind of lighting mode has become a conventional and reasonable configuration.

With the development of the hotel industry in China, especially with the continuous entry of international hotels, people begin to have requirements for home lighting, and also want to have a comfortable lighting way like the hotel, so home decoration also introduces a professional lighting design concept.

Taking LED light source as an example, the lighting industry will use a lot of professional knowledge, but I only aim at ordinary consumers here, standing in the perspective of designers to popularize several important knowledge points.

Power and luminous flux: we usually evaluate the brightness of lamps based on power, which is relatively accurate in mature products such as incandescent lamps, fluorescent lamps, halogen lamps and other types of lamps, but because LED light sources are in constant development, it is generally not standard to use power to measure the brightness of lamps, and the brightness of the same power is different in different periods.

Therefore, in LED industry, luminous flux is usually used as brightness standard. Luminous flux refers to the total amount of all light emitted by the light source, which is proportional to the power. But when we choose lamps, we are still used to power as the brightness standard, which is no problem for users.

Color temperature: simply speaking, it is the color of light, and the process of color temperature from low to high and from warm to cold. Take the sunlight of a day as an example. The color temperature is from low to high from sunrise to noon, and from high to low from noon to sunset.

The market is generally represented by yellow light, neutral light and white light, which are 3000K, 4000K and 5500k respectively.

3000K yellow light, giving people a warm feeling, suitable for use in the bedroom or as a wall lamp.

4000K neutral light, widely used, with the feeling of sunlight.

5500k white light, mostly used in the living room, but with people’s pursuit of comfort, now it is less used in the home, basically replaced by 4000K color temperature.

The color temperature of the light source can be customized, which is suitable for users with high requirements for color temperature.

Color rendering: refers to the degree to which the light shines on the object and presents the inherent color of the object. This is based on sunlight. The better the reduction degree, the more natural it is to prove the better the color rendering. The value of 100 is the highest. I’ve seen 97 LED light sources on the data. But generally speaking, the color rendering of LED is not as good as halogen lamp, which is also the reason why many clothing stores continue to use halogen lamps with high power consumption.

It seems that color rendering is not very useful for ordinary household, but if you have used lamps with high index, you can still feel the gap if you look at the lamps with low index.

The quality of light source of many manufacturers is very poor, no matter how high the color rendering is written, it is recommended that ordinary consumers buy Lamps of regular brand, and some miscellaneous brand light sources will be seriously green.

Brightness and illuminance:

Brightness: refers to the brightness that the light source feels when illuminating the object’s eyes, which is related to the surface characteristics of the object.

Illuminance: general refers to the actual light intensity that the light source irradiates on the surface of the object. The illuminance value does not consider the factors that affect the surface of the object.

Brightness and illuminance are easy to be confused. Illuminance is often used in lighting design, which is the key factor in design. In order to achieve the illumination value of a certain working face and the ground, the power of the light source will be adjusted accordingly.

Ordinary users will not be professional to test, just consider whether the brightness is appropriate. Generally, the old way is to install a light source to feel with your eyes. When it’s bright, the power will be reduced, and when it’s dark, it will be added again. But this method is not accurate, because the human eye will automatically adjust the pupil to adapt to different brightness environment.

The best way is to buy an illuminance meter, about 100 yuan. Find a suitable space to measure the luminance as a reference, and record the value. Measure the illuminance when purchasing lamps. If it is not suitable, adjust the power of light source to close to the desired value. For the table, desk lamp position can be used to choose more appropriate illuminance table, to avoid too bright or too dark discomfort.

In addition, it should be noted that if the indoor color is darker, the illuminance of the required lamp will be higher. If the indoor color is lighter, the illuminance of the required lamp will be lower. This is also an important factor in the lighting design.

The national illuminance reference standard gb50034-2013 is mainly formulated by taking the average value according to the standards of the United States, Japan and Russia. The standards formulated by this method may only be referred to.

Glare: simply speaking, the light directly directed to the eyes, and the light that is uncomfortable to affect the line of sight, the most direct is the feeling that the car headlights are directed to the eyes.

This is a very important factor to meet the comfort level. In popular parlance, the most comfortable lighting is to see the light without seeing the light, which is the basis of the requirements of senior hotels.

When choosing lamps or decoration design, we must consider this problem. We should try our best to make concealed lamps or choose lamps with lampshades. Now many spotlights have done anti glare treatment. We can choose deeper spotlights with hidden light sources to avoid glare. In addition, the angle of exposure is also a factor affecting glare.

Lighting is not only the function of illuminating the space, but also the combination of decoration and comfort. Now people pay more and more attention to the problem of light pollution. Before decoration, we should learn more lighting knowledge to make the home space more comfortable.

My WeChat official account: Yu’s design ideal

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