Luminous flux (Lumen)
Is the value of the total radiation emitted by a light source as visible light. At this, the brightness sensitivity of the human eye regarding the various wave lengths is of significant importance. Two light sources of different color therefore have the same lumen value, if they are perceived as equally bright.

Luminosity (Lux)
The luminous flux directed to a certain area is indicated as luminosity. At this, 1 lumen per square meter equals 1 lux.

Luminous efficiency (Lumen/Watt)
This value defined the efficiency grade of a light source. The higher the value, the better the conversion of the consumed power into visible light. This value is perfectly suitable for any comparison of different light source regarding their efficiency.

Color temperature (Kelvin)
This value measured in Kelvin defines the optical color impression of a light source. The higher the value, the bluer the light appears. In the range of 5000 K for example, the temperature color is defined as daylight white.

 

Color rendering index (Ra)
The so called CRI (Color Rendering Index) describes the ability of a light source to reproduce colors. 
At this, the natural solar light has the best color rendering index (CRI = 100) and is used as reference. The higher the CRI value, the better the color rendering ability. A CRI index of 95 is regarded as excellent.

The IVT quality lamps are equipped with the most various features, functions and possibilities of application. Below table provides an overview on the used symbols with brief explanations.

			Light source Maximum power consumption (e.g. 8 W) as well as the manufacturer and/or type of the used light source. (e.g.  Luxeon) | Maximum luminous flux in lumen (e.g. 900 lm)
			Beam angle and lighting range The opening angle in which the light is radiated. (e.g. 80°) | Maximum lighting distance in the strongest lighting mode (e.g. 70 m)
			Runtime Maximum runtime (e.g. 3 h) in the selected performance level (e.g. 100 %)
			Flashing function Maximum runtime in the selected flashing function (e.g. 6 h)
			Emergency light function In the case of power outage the lamp turns on automatically, turning into a safe emergency light.
			Battery type Details about the used energy source (e.g. Li-Ion) with notice regarding the ability to be recharged.
			IP protection type Defines the suitability of electrical equipment for the various environmental conditions.
			Explosion protection This product is suitable for use in environment with risk of explosion.
			Touch switch The lamp is switched on /off by touching.
			Wall mounted The lamp is suitable for wall installation.
			Ceiling mounted The lamp is suitable for ceiling installation.
			CE symbol This symbol confirms the fulfilment of elementary requirements regarding the applying EU regulations.
			Mobile application  Suitable for use in the most various vehicles (e.g. private car).
			Stationary application Suitable for us in buildings with autarchic 12 V/24 V power supply (e.g. solar or wind power).

The protection type designation normally consists of the letters IP and two key figures. These indicate which degree of protection of a housing offers regarding touching or foreign objects, respectively (first key figure) and humidity or water, respectively (second key figure).