WHAT YOU SHOULD KNOW ABOUT LIGHT AND BULB
We perceive 80% of information visually, so light is very important to our lives. The lighting solution for offices and public spaces is governed by approved standards. In contrast, lighting of private interiors is up to each owner. Various surveys show that household lighting is only half the value recommended by the International Commission on Illumination. In low light, eye fatigue occurs very soon, so it is necessary to carefully consider what lighting we will use in each room.
In the living room is suitable to use several types of lamps. We use wall lights if we need less intense, diffused light. Intense, local light is provided by a floor lamp or a desk lamp.
Direct and intense lighting is required in the kitchen area where food is prepared and consumed.
In the room, which is designed for rest, we choose the dim light of table lamps. Halogen lights are not recommended for this purpose.
The light intensity is measured using the LUX unit. 1 lux is calculated by the ratio of the luminous flux incident per 1 m2. E.g. Ideal lighting values on the kitchen counter, on the work table in the children's room is 300 lux, in the living room 200 lux is recommended, for fine work 500 lux is recommended.
We must not forget the colors of light in the environment, because they also affect our mood and feelings.
Each light produces a different color. The color of light is determined by its temperature. It is given in Kelvin (K).
The warm white color has a temperature of 2700K, the white color 4000K. Libraries with study rooms use fluorescent lamps with a color temperature of 6500K cold white.
Examples of light temperature:
1200 K: candle
2700 K: classic light bulb
5000 K: normal daylight
6500 K: standardized daylight
7000 K: slightly cloudy sky
8000 K: cloudy sky
The color spectrum is the visible part of the magnetic spectrum of different wavelengths (nm) for the human eye. The individual colors appearing on the light spectrum are called spectral colors - red 650 nm, orange 600 nm, green 555 nm, blue 450 nm, etc.
INFORMATION FOR THE CORRECT CHOICE OF LIGHT SOURCES (BULB)
Carbon fiber (also carbon fiber)
Carbon-containing fiber in various modifications. The first carbon filament for a light bulb was made from bamboo wood by T. A. Edison in 1880. In 1971, carbon fibers from polyacrylonitrile began to be manufactured industrially. However, light bulbs are energy-intensive and do not last too long. They also radiate a lot of heat. All these bulbs are dimmable.
Energy saving light bulbs
An energy-saving light bulb, unlike a conventional light bulb, which works on the principle of a hot filament, contains a small amount of inert gas. As a result, the service life of these bulbs is many times longer. However, the longer the "warm-up" time, reaching the declared light, can take several minutes. This type of light bulb has long been surpassed by LED light bulbs.
This bulb was discovered in 1907. It consists of an anode and a cathode, which are sealed in a transparent housing. It works on the principle of a classic semiconductor diode. LED emits visible light as well as ultraviolet or ultra-red. They are energy efficient, but unlike "energy saving" light bulbs, these bulbs light up immediately. Quality chips last a very long time. Please note that not all species are dimmable, it is necessary to be sufficiently informed. They have no glass parts, so they are resistant to shocks and are not as fragile as other types of light bulbs. Today they are the most used. The choice and various options of both wattage and temperature and light intensity give the consumer a wide range of options for choosing the most suitable lighting for a given room.
When converting between an ordinary light bulb and an LED bulb, it is best and most accurate to follow the Lumens (lm), this value is usually stated on the box, conversions according to wattage may not always be accurate.
Comparison: Classic light bulb - LED light bulb
Classic light bulbs with carbon fiber LED bulbs
15W 90 lm
25 W 200 lm
40 W 400 lm
60 W 700 lm
75 W 900 lm
100 W 1300 lm
A halogen lamp is a special type of lamp in the atmosphere of which a compound of a hall element (halogen, eg bromine or iodine) is added to the atmosphere inside the bulb. Compared to conventional light bulbs, these bulbs have a higher filament temperature, ie higher light efficiency, whiter light and longer life, which is not affected by frequent switching on and off. A side effect of using quartz glass instead of normal is ultraviolet radiation. Because the bulb bulb is very hot during operation, there is a risk of fire, damage to objects or burns if it bursts.
As of September 1, 2018, halogen bulbs can no longer be manufactured or imported into the member states of the European Union.
WATT - power, radiant flux
VOLT - electric voltage, electric potential
LUX - lighting intensity
LUMEN - luminous flux
KELVIN - light temperature