What is the meaning of the light stream and the intensity of the light for lamps and lamps
Title: lampi, applici 
One of the most important is the characteristics of the lighting device and the light flow that you created. It is from the tosi that the indicator depends more on the effectiveness of all kinds of illuminator - from a table lamp to a searchlight on a ship. But for some reason, yes, all figures are used, which are absolutely meaningless on the right look, but it is necessary to clearly understand how the light flow is, how it is measured, and how it is connected with lightening.
Containment: 1. What e 2. How and how everything is measured 3. Typical light flow for different sources for light 4. What kind of clarification is this and how can we bring it together with a light stream
What e
The scientific definition of light flux (LF) is the amount of light, which is somewhat characterized by the amount of energy, transpired from light emission over a certain period of time. On the other hand, tazi stamina showed how sharply bright the product was, the source was identified. On a daily basis, the term “bright stream” is often replaced from a concept for brightness or intensity to lightness. Contrary to the fact that such a crushing cannot be considered correct, it is essential to determine that, Makar and not guilty, reflecting - sharply on the heads and brightening the stream from the source, sensible by honesty from the eye-bright.
Protecting the flow and brightness of the light is not sa ednakvi
Yes, let's suppose that before the person of the ima there was a crush with a lit flask and a spotlight with a small gl on the scatter, in some way the crush was folded from the cathode source to the light. What is the source of light in the bright spot, brightly? Searchlight, take it apart.And here it’s not in SP (the same one and eating for two pins), but in a sharp hit from it in the eyes of the observer or the top of the object, appreciating the brightness of it.
According to the beginning of the concept for the light stream, it is determined by the light energy, emitted from the source, and the intensity of the light (on a daily basis, it’s just brightness, sometimes it’s not confusing for sure) it’s self-imposed, sometimes acting directly on the top of the object and the eye. This is why the concepts of "SP" and "brightness" are generally not the same.
How and how everything is measured
SP - the amount of light, some measure in the lumen (designation in Cyrillic - lm, internationally - lm). A single lumen of correspondence to the stoicity on SP to isotropic (eliminating in the branches of the sap) source with a bright intensity of 1 candela (cd), converted to platen yal from 1 steradian (sr). Such a total light flux to an isotropic source cc light intensity 1 cd is still equal to 4π.
Therefore, for measuring the total SP, it is necessary to foresee the light energy that spreads all the saplings, it is quite difficult (and not necessary) and all to direct it into bit conditions without special equipment.
In production, for these purposes, spherical photometry and goniometry are used. The camera is a little too large for a sphere, the reflection coefficient is close to 1. The source is placed in the basin of the sphere, and the measurements are distorted into light, reflected from the wall to the camera with the help of a photo sensor, equipped with capacitance for direct illumination and special light filter.
Gonometry work on the principle of sequential scanning.In this case, the case of a light meter (measurement for illumination) is moving around the study of the object and measuring the illumination for points on the imaginary sphere. The next step is to obtain the data for all processing and analysis based on the values of the cost per total light flux at the source in the lumen.
Typical light flow for different sources for light
Kogato kupuvate tova or she is a lighting device, tryabva and you know how the joint venture looks like. But, for regret, it’s not all kinds of crumbs and it’s a lot of tosi parametr. Many times lampifor example, they usually sell everything without a passport and the only available characteristics for tyah sa save voltage and energy consumption.
Regardless of the product, for devices that work on the same principle (pressed lamp, fluorescent, LED, etc.), there is a direct connection between the consumption of energy and the light stream generated from the lamp:
Table for compliance with power consumption and SP for different types of lamps
LampiFluorescent lampsConsumer power, WCreated by cn, lmConsumer power, WCreated by cn, lm202505-72504040010-124006070015-167007590018-20900100120025-301200150180040-501800LED lampsConsumer power, WCreated by cn, lm3-4250-3004-6300-4506-8450-6008-10600-90010-12900-110012-141100-125014-161250-1400 back kjm sdzharzhanieto ↑
What is the clarification and how can we bring the light stream
Spred theory, luminosity, sometimes measured in lux (lx), e is a physical light value, sometimes showing a sharply evenly distributed light stream falling up the object from a certain area.
It is obvious from the mountain that the illumination on the object depends on the strength of the light stream. But clarification is exactly the same product, for some reason the intended purpose of lighting systems.How can these two values be connected? Vsshchnost, for practical use, a lamp is determined, dory with a known value for SP, shaking and you know how well you can illuminate an object. But the course at the elementary school is not completely taken away, it’s not difficult and you can lighten it with SP, it’s like it’s illuminated on the object and it’s equal to the ratio of the light stream to the area on the tozi object:
E=F/S,
kadeto:
- E - lighting in the apartment;
- F is a stream of light in the lumen, falling up the object from the given area;
- S - area per object in square meters.
Whenever lighting is planned, for example, in an office or apartment, they will usually set the necessary lighting for an object with a known area and always add up to the total light flow, the cost is necessary. Therefore, in a convenient way, the formula is given here in the following format:
F=E*S.
There are two questions left for resolving:
- What kind of clarification can be considered optimal.
- How can we calculate the area per object.
The first task is forest for resolving. For yes, send tov, just look at the table downstairs:
Table of standards for lighting on premises for various purposes
Production and public premises Domakinski premises TypeIllumination is predominant, lx TypeIllumination is predominant, lx Office 300 All day, kitchen 150 Rooms for writing and drawing 500 December 200 Halls for conferences and meetings 200 Sauna, corridor to the apartment 50 Service column 50-100 Wardrobe 75 Corridor 50-75 Library, office 300 Archival flock 75 Domakinsky column 20 Engine room, keeler, warehouse 5 0Pluven pool, sauna100
Now in the district.If the lighting is not soaked and the trembling and the room is closed, then it is sufficient and you can use the additional value in the furnace formula - the coefficient for the correction K, which is all foreseeable on the tavanite:
F=E*S*K,
kadeto:
- K = 1 from the height of the tawana up to 2.7 m;
- K = 1.2 from high to tavana 2.7-3 m;
- K = 1.5 from the height to the tavana 3-3.5 m;
- K = 2 from the height to the tawana over 3.5 m.
Important! The technique used on the basin allows you to get a very approximate result (which is usually sufficient in any case), this coefficient for reflection on the surface of the object is not foreseeable, in some way it influences the color on the tapeta, hearth, furniture, ogledala, etc. .
In case the lighting body is wet, in addition to the SP cam, you also need to take a look and other parameters that will determine the amount of illumination: heat lamp, in some lamps, and the distance from the illuminator to the object:
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