First, how to choose a light bulb
1
First understand a concept - luminous flux
Luminous flux (Lx) refers to the radiant power that can be felt by the human eye. Refer to the standard value of illuminance per level in the following figure:
Room (location) reference plane and its high illuminance standard value (Lx=LM/m2) General activity 0.75m horizontal plane 100 writing reading 0.75m horizontal plane 300 suitable mixed lighting restaurant 0.75m dining table 150
2
Refer to the luminous flux to see the house area
The reference data in the above figure is the luminous flux per square meter. For example, if the room area is 10 square meters, the luminous flux of 10m2×(100~300)LM/m2=1000~3000LM is needed.
3
Determined by the function of the space
Based on the luminous flux, it is determined according to the function of the space. For example, the above reference table, the general activity is 100LM/m2, while the writing and reading requires 300LM/m2, but if the desk is placed in the bedroom, if a main lamp is installed, Then, when you perform general activities, it will be too bright. At this time, you can use "mixed lighting", that is, install a desk lamp or other auxiliary lighting.
4
Wattage and luminous flux
In most people's daily habits, when buying a light bulb, only know the wattage (W), then what is the relationship between wattage and luminous flux? This leads to another concept - light effect (lm/W), The efficiency of converting electrical energy into light energy.
For example, a 20W bulb has a luminous efficacy of 100lm/W (the general LED light source has a luminous efficacy of 90~130lm/W), then the luminous flux = 20W*100lm/W=2000lm.
Because the light effect of each business and model of the light bulb is not the same, you can buy the box that can see the product or consult the relevant information of the merchant.
5
Will the main lights be too dark?
In the case of multiple lamps, the luminous flux is generally additive.
For example, a room of 10m2 requires a luminous flux of 1000~3000LM. The luminous flux of a downlight is 200LM, so theoretically, a 5~15ç› downlight can be installed in space evenly.
Of course, under actual circumstances, it is impossible to install so many downlights in a space of 10 square meters. At this time, under the condition that six 200LM downlights ensure that the general activities are bright enough, a 300LM table lamp is separately installed in the corner of the desk because The range that the desk needs to illuminate is also about 1m2, which is enough.
Of course, this type of illumination is the opposite of the design with primary lighting, which makes the overall space brighter but the middle area relatively dark.
Second, factors affecting the brightness of space
It is ok to use luminous flux as a light bulb, but in terms of overall lighting experience, factors to consider are:
1 Space tones, such as dark spaces appear dark, and light spaces are brighter.
2 furniture size, if some of the larger size furniture in the space will block light, this time should also consider the reasonable separation of the light to be more comfortable.
3 people feel, this is the most important, because everyone is sensitive to the light, I have met a customer, he asked every corner of the house is "very bright", because he likes this bright a feeling of.
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Let me summarize some of the concepts mentioned in the article:
1 luminous flux (unit: lm), refers to the radiation power that the human eye can feel;
2 illuminance standard value (unit: LM/m2), the reference value of normal household according to demand is 100~300LM/m2;
3 watts (unit: W), power;
4 light efficiency (unit: lm / W), the efficiency of conversion of electrical energy into light energy, the general LED light efficiency is 90 ~ 130lm / W.
Therefore, if it is a led bulb, it is probably a 1-3 watt bulb in a flat space.
However, in reality, it is impossible for the entire room to be in the space for reading and writing. Only a small corner is the case. Therefore, the room of 10 square meters is usually about 10W, and then the area where the book is written and written, and then the table lamp can be used alone. .
In addition to the brightness, we must also consider the color temperature of the lamp, cold light or warm light, which is also an important factor in creating a home atmosphere.
Editor: Liang Jieying
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