The Large Light Glossary: About Lumens, Watts, LED, Energy Saving Lamps Etc

With the time period is specified, until a lamp reaches 60 per cent of the specified brightness value.

Light intensity is the amount of light that falls on a unit of surface area. The unit is (lm) lumen per square meter measured in Lux (lx).

Not all lamps are dimmable. Incandescent and halogen lamps are dimmable, but not all LED and CFLs. A symbol on the packaging indicates whether a lamp dimmer operation is appropriate. With energy-saving lamps, which are controlled with conventional dimmers, the much desired change of in light color is eliminated but, as it occurs in incandescent lamps. Energy-saving lamp light is not red, if it is dimmed.

Energy efficiency
Energy efficiency (EEL = energy efficiency label) a lamp varies from A to E, where A is the highest energy efficiency. LED – and energy-saving lamps are extremely efficient, followed by energy-saving halogen lamps. The conventional incandescent lamp is marked with energy efficiency class E, because it converts only 5 percent of the energy consumed in light, the rest is wasted as heat. The most energy-efficient lights save up to 80-90 percent of the energy compared to a conventional incandescent lamp.

Energy-saving lamp
Energy-saving lamps can be best described as folded fluorescent lamps, which have a ballast in their standard E14 or E27 lamp socket. The light is generated by an electrically conductive gas plasma of low pressure in the discharge tubes instead of a filament. The resulting invisible electromagnetic radiation is converted by a fluorescent.
The composition and quality of the phosphor determine the color of the light and the colour spectrum of light. Certain colors in the environment can thus emphasizes, but might also not play back properly. There’s also significant quality differences between brands and cheap products to the part.

Color rendering property of lamps
Although white light source colour appear equal, it may be that illuminated surfaces and objects do not look the same. The white light can be the result of a different combination of light colors. A red cloth looks only red, red color components are included in the white light. However, is the white light is produced from predominantly yellow and blue components of the color spectrum, the cloth appears gray-Brown, since it lacks red light that can be reflected by the object. The colour rendering index CRI (international) or RA value is used to evaluate the color rendering properties of lamps.

Halogen light bulb
Tungsten-halogen lamps are thermal radiators like standard incandescent. The fundamental difference to the standard light bulb is that the halogen burner with a halogen gas is filled. This allows a higher filament temperature and extended lamp life. This increases the luminous efficacy of a halogen lamp on one and produces a brilliant light to another with very good colour rendering properties. It works with its 3,000 Kelvin but slightly cooler than a standard light bulb.

By the color temperature, Kelvin (K) is given the light colour of a lamp in the unit. The value indicates whether a lamp warm white (under 3,300 K), neutral white (3,300 to 5,300 K) or Daylight White (about 5,300 K) produces light. Incandescent and halogen lamps are due to the technology always warmwhite.

A lamp is the light source that is used in a lamp, a chandelier or a spotlight and there serves as a light source. In the simplest case a lightbulb. The lamp must be screwed in the light to shine. By the way: The written and currently commonly heard term “Backseat” is incorrectly used in 99% of cases. It is almost always the energy saving lamp.

Service life
The life of a lamp is specified on the packaging in hours and years. Light bulbs have an average lamp life 1000 hours. Energy-saving lamps between 8,000 and 12,000 hours, 3,000 hour halogen bulbs, LEDs between 20,000 and 25,000 hours (certain models for professional light applications even 50,000 hours).
To assess the average lamp life in years, it will be determined that a lamp for home lighting per day on average three hours is switched on. Therefore, the rule of thumb is that 1,000 hours about equivalent to one year of usage. Because statistical averages, variations in individual lamps are of course possible.

Light-emitting diodes (LEDs) are light-emitting diodes and have either a filament or a gas discharge path. There are small crystals (solid state), who – connected – light give to a circuit. The light color is dependent on the used semiconductor material.
With LEDs (light emitting diodes) can produce not only pure strong light colors, but also white light for general illumination. That happens today mostly through conversion of blue light with the help of a phosphor, much like in the energy-saving bulbs. Thus, you can generate all whites. For the living room lighting, there are it in warm white and cool white.

Because LEDs produce no UV and IR radiation hardly (compared to conventional lights), textiles and paintings, for example, of the fading spared and we feel no heat when light hits our skin.

Colloquially, the term “Lamp” is often used as a synonym for a lamp. A lighting device that consists of a wall, ceiling mount, or a foot, possibly a switch, shade or reflector, the lamp and the lamp is meant.

Luminous efficacy
The light output of a lamp indicates how much light per watt of input electric power is generated. It is a measure of efficiency and effectiveness. A standard light bulb 60 Watt and a light output of 710 lumens has a luminosity of around 12 lm/W. A 12-Watt energy saving lamp with 725 lumens comes on around 60 lm/W.

Light color
White light, too artificial, consists of a mixture of colors. Depending on the percentage of the color components arise various shades of white. The red part is higher, the white of lamp is warmer than at a higher proportion of blue. The light color specified by the color temperature Kelvin (K) in the unit. The value indicates whether a lamp warm white (under 3,300 K), neutral white (3,300 to 5,300 K) or Daylight White (about 5,300 K) produces light. Incandescent and halogen lamps are due to the technology always warmwhite.

Luminous intensity
Luminous intensity is defined as the luminous flux emitted in a certain direction (reflector lamp).The unit is candela (cd).

Luminous flux
Luminous flux is the overall performance of the light given off by a completely bright light source.The unit is lumen (lm).

Lumen (lm)
Lumen is the unit for luminous flux, indicating how bright is a lamp. The higher the lumen value, the brighter the light. So far, the performance of a standard lamp was specified by their power consumption in Watts. New technologies require significantly less energy to produce the same amount of light. Therefore the brightness of the lamp in lumens is shown in addition.

OLEDs (organic light emitting diodes) are similar to LEDs, use however organic semiconductor material. OLEDs are embedded in ultra-thin illuminated surfaces and radiate soft diffused light.Thus they allow innovative design solutions and are also energy-efficient.

RA value
The colour rendering index CRI (international) or RA value is used to evaluate the color rendering properties of lamps. The RA-scale ranges from 50 to 100. The lower the RA value, the worse the color rendering property of a light source. Incandescent and halogen lamps have a continuous color spectrum and can thus produce the whole range of visible light (RA value: 100). Energy-saving lamps and LED’s depends on the spectral composition of white light. Here, the RA value is now between 80 and 90.

Mercury content
The mercury content displays whether and if so how much milligrams mercury contains a lamp.

Switch resistance
A lamp can only up to a certain number of times a-and turned off
be. That can be decisive for the life. How often a lamp can be switched on and off without taking damage, is given in cycles.

Base type
Lamps packaging is pointed out with pictograms on the base of the bulb (E.g. standard screw base, high-voltage halogen socket, low-voltage halogen socket).

Standard light bulb
Standard light bulbs are a thermal radiators and possess a continuous spectrum of light with all the colours of the Rainbow. The main part of the range lies in the visible red and in the invisible infrared region. The result is the typical warm-white light with a colour temperature of about 2,700 Kelvin, however with a high heat radiation (light of five percent, 95 percent heat).

Startup behavior
The startup behavior explains how fast the light reaches a certain light intensity. Glüh-, halogen and LED lamps start instantly, while energy-saving bulbs need a little time to achieve full brightness.

Comparison value
The comparison value on a packaging of the lamp indicates the included lamp with the specified electrical output corresponds to the classic light bulb (in watts)

Watt (W)
Many people think that the wattage measures the brightness, but in reality it indicates the power consumption of the lamp. Energy-saving lamps and LED lamps need usually less electricity (and therefore have a lower wattage), to provide the same amount of light as a conventional lamp with a higher wattage.