Light power calculation
(1) The chandelier suspended on the ceiling is under the action of gravity and tensile force, and it is in a static state under the action of these two forces, which indicates that these two forces are a pair of balanced forces, and the size is equal, as shown in the figure below.
Different types of incandescent lamps can have different light effects, so the illumination is also related to the position of the light receiving surface and the light source. The conclusion is that there is no direct relationship between the power of the bulb and the lux of the illuminance. The unit of the rated power - watt (W), for example, the rated light of a 60W ordinary bulb can reach 1650lm, and the luminous efficiency is almost twice as bad. Then the illuminance is also related to the lamp
Lux is the unit of illumination. The luminous flux of 1 lumen (LM) is evenly distributed on the surface of 1 m2, and the luminous intensity proced by the bulb is expressed as "luminous flux". The luminous intensity proced on the surface of 5 M2 is 2 lux, and the luminous flux of 1 lumen (LM) is evenly distributed at 0. The electric light source foundation takes incandescent lamp as an example, and the rated luminous flux is 850 LM
extended data:
the power of LED bulbs can be divided into 0.5W, 1W, 3W, 5W, 10W... 100W, which is different according to the power of molded procts after packaging
the rated current of low-power LED bulbs is 20mA, and those whose rated current is higher than 20mA can be regarded as high-power basically. The general power numbers are: 0.25W, 0.5W, 1W, 3W, 5W, 8W, 10W, etc. The main luminance unit is LM (lumen), and the low power luminance unit is MCD
As shown in the figure:
The direction of the tension F of the chandelier to the lamp rope is vertical and downward, and the action point is at the contact point between the lamp line and the lamp, as shown in the figure:
in the series circuit, it is proportional to the resistance value. U = IR, I is the current, R is the bulb resistance value
in the hybrid circuit (both series and parallel), the specific analysis method is: first calculate the total resistance value of the parallel part of the circuit, and use the formula of 1 / r = 1 / R ① + 1 / R ②. This part is replaced by equivalent resistance. Turn into a series circuit and calculate the resistance of the series circuit
1. There are several kinds of lamp classification. There are mainly four types of lamp classification, namely, according to the distribution characteristics of light source in space, according to the structure of lamp, according to the installation method, and according to the type of light source. In our daily life, the wall lamp, ceiling lamp, embedded lamp, chandelier, floor lamp and so on are classified by installation methods
Second, what are the common household lighting procts
1. The number of chandeliers in the home is less, which is generally concentrated in the living room and dining room area. Other functional areas basically do not choose chandeliers, but there are many patterns of chandeliers, such as single chandelier, multi chandelier, etc. when choosing, you need to pay attention to the height and style of the chandelier<
2. Ceiling lamp
ceiling lamp is generally installed on the ceiling by means of absorption and embedding. This kind of lamp is the main lighting equipment like chandelier. It has a wide range of use. Basically, ceiling lamp can be installed in each functional area, but the appropriate size and light source should be selected according to the space area
3. Floor lamp
floor lamp is common in the living room and rest area. It is usually used with sofa and coffee table. It not only has local lighting function, but also can decorate the home
4. Wall lamp
if there are long corridors and stairs in the home, it is a good choice to install the wall lamp. The wall lamp is generally installed at the position of 1.8 meters on the wall
the above is about the classification of lamps, as well as the introction of common household lighting procts. I hope it can help you.
Illuminance calculation method
utilization coefficient method
this method is used to calculate the average illuminance = (luminous flux of light source) ×( CU) ×( MF) ÷ Area of irradiation area
utilization coefficient: 0.4 for general indoor, 0.3 for physical ecation
1, illumination distribution of lamps
2, efficiency of lamps
3, relative position of lamps in irradiation area
4, reflected light in surrounded area
maintenance coefficient MF = (LLD) x (LDD) 0.7-0.8
average illumination (EAV) = luminous flux of single lamp Φ× Number of lamps (n) × Space utilization coefficient (Cu) × Maintenance factor (k) ÷ Floor area (L) × The only thing we need to know is some parameters of LED, such as its beam angle is generally 120 degrees
in terms of light efficiency, a good lamp theory is 100lm / W, and a 100W incandescent lamp is about 1200lm, that is to say, the luminous flux of a 12W LED lamp is equivalent to a 100W incandescent lamp, which is the origin of energy saving. Of course, actually it's only theory. Specifically, we have to consider the loss of LED's power supply, the loss of light and heat divergence, and the light decay and so on
extended data:
calculate the illumination according to the power of the lamp:
1. The illumination distance has a great relationship with the luminous angle. The smaller the angle is, the more focused the light is and the farther the illumination distance is. The power can roughly judge the brightness of the lamp
In general, 24W high-power 60 degree angle is estimated to be able to irradiate about 15 meters, 30 degree can irradiate 20 meters away, and the reflective cup can be used to focus light for more than 30 meters3, indicating that the stronger the ability of the lighting equipment to convert electric energy into light energy, that is, the stronger the energy saving of the lighting equipment under the condition of providing the same brightness; Under the same power, the stronger the illuminance, the greater the brightness. The higher the building, the higher the power of the projector
4. At present, the commonly used LED projectors in the market basically use 1W high-power LED (each LED element will have a high luminous efficiency lens made of PMMA, whose main function is to distribute the light emitted by the LED, that is, secondary optics)
The chandelier suspended on the ceiling is under the action of gravity and tensile force, and it is in a static state under the action of these two forces, which indicates that these two forces are a pair of balanced forces, and the size is equal, as shown in the figure below.
simplified traditional Kangxi stroke meaning five elements
Liu Liu 15 fire
Yi Yi 1 Soil
Deng Deng 16 fire
Tiange - & gt; 6 (native)
personality - & gt; 6 (soil)
geogrid - & gt; 7 (gold)
outer case - & gt; 17 (gold)
total case - & gt; 32 (wood)
analysis of Tiange 16: Tiange number is handed down by our ancestors, and its mathematics has little influence on people
(thick and heavy) virtue, wealth and honor, wealth and official beauty, success and fame Good luck)
→ detailed explanation:
to fight against evil and turn auspicious images into good omens for prosperity and prosperity
the poem says: a noble man should be supported by heaven, and he should have wealth above others. He should not be greedy for his career
it's expensive to get help from Xingjia Daji)
basic career: Tianguan, Guiming, Jiajie, Jintian, bachelor, chivalrous, jichan
family: flowers bloom in spring, and family is expected to be complete. Men have good wives, but women should not marry early
Health: flowers and plants in spring, more expensive than pornography, caution is expected to be healthy
meaning: to turn evil into good. As a leader, he has the upper hand. He is magnanimous, resourceful, good at coordination, and famous. To be able to obey is a good expression of great success and prosperity< Analysis of personality 16: personality number, also known as Zhu Yun, is the central point of the whole name, which affects the fate of a person's life
(thick and heavy) virtue, wealth and honor, wealth and official beauty, success and fame Good luck)
→ detailed explanation:
to fight against evil and turn auspicious images into good omens for prosperity and prosperity
the poem says: a noble man should be supported by heaven, and he should have wealth above others. He should not be greedy for his career
it's expensive to get help from Xingjia Daji)
basic career: Tianguan, Guiming, Jiajie, Jintian, bachelor, chivalrous, jichan
family: flowers bloom in spring, and family is expected to be complete. Men have good wives, but women should not marry early
Health: flowers and plants in spring, more expensive than pornography, caution is expected to be healthy
meaning: to turn evil into good. As a leader, he has the upper hand. He is magnanimous, resourceful, good at coordination, and famous. To be able to obey is a good expression of great success and prosperity
analysis of DIGE 17: DIGE number, also known as qianyun, affects people's activity before middle age (36 years old)
(firmness) the authority is strong and can break through all difficulties. If you can tolerate it, you will succeed Half auspicious)
→ detailed explanation:
the authority is strong, there is no one, so that people do not get along with each other, if you avoid this shortcoming, it is good luck
the poem says: to break through all difficulties, the authority is high, the rigidity is stubborn, and you must be cautious and keep peace, and you can get great achievements and blessings
the number of hard and soft to break through all difficulties Half auspicious)
Foundation: Tiangong, Jiangxing, Weiwu, art, civilization
hope to adopt
LX (Lux) is the unit of illumination
the minimum change of illuminance is obvious in subjective effect, and the difference of illuminance is about 1.5 times, which is roughly consistent with CIE International Committee on luminous illumination standard indoor workplace lighting S008 / e-2001.