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LEDs are light emitting opto-electronic semiconductor components. Since decades, they are used in the field of man-machine communication to convert electrical signals into visual information.
Typical LED applications encompass household appliances, telecommunications, life sciences and signal technologies. Moreover, due to its low power consumption and excellent operational reliability LED technology partly replaces conventional lighting solutions already today.
The development of LED technology progresses at rapid pace, as light efficiency (Lumen/Watt) increases, colour qualities improve and temperature ranges get manageable. Consequentially, new territories of applications will open up, especially in the field of standard lighting.
Based on their structure, LEDs can be split into quattuor groups:
Light technology. covers the generation and application of light as well as lighting technology and methods and processes of light evaluation, i.e. the measurement of light-related parameters; these include illuminance, luminance, and luminous intensity.
Illuminance Ev is defined as the areal light flux density on a lighted area hit by the luminous flux Fv. Illuminance is measured in lux (lx=lm/m2), where luminous flux and area are put in as [lm] and [m2], respectively. Based on the illuminance Ev, a specific lighting solution can be calculated and designed.
Luminance is defined as the areal density of luminous intensity of a light emitting or reflecting area which radiates the luminous intensity Iv at a given angle. Luminance Lv is measured in [cd/m2].
Luminous intensity Iv
Luminous intensity Iv [cd] is among the key parameters describing an LED or LED display. It is defined as the luminous flux emanating from a point source within a solid angle W (steradian) into a particular direction. Hence, luminous intensity is the directional luminous flux Fv within a solid angle W. Today's LEDs achieve a luminous intensity of Iv=10 cd or more. As intensity depends on the radiation angle, an LED chip equipped with a 30° reflector achieves a higher luminous intensity than an identical LED chip with a 60° reflector. That is, using a 60° reflector the same luminous flux Fv has to illuminate a larger area than using a 30° reflector.
In addition to these parameters, VS Optolelectronic's in-house photometric laboratory is equipped to analyse all photometric, colorimetric and radiometric characteristics. Two in-house Gonio spectrum radiometers exactly determine the radiation characteristics of LEDs and LED light modules of up to 350 mm Φ.
LED-Technology eco-friendly and eddective
- LED lighting system saves electrical power !
- 80% compared to incandescent bulb
- 50% compared to compact fluorescent lamp
- 60% compared to fluorescent lamp
- 75% compared to halogen lamp
- 80% compared to mercury-vapor lamp
- 65% compared to high pressure sodium lamp
Long life and cost saving with green energy !
LED Light sources are directional light sources.
LEDs offers up to 100 lumen/W compared to HPS with 140 lumen/W.
The lifetime for LEDs with only low operating voltage is 3-4 times higher than HPS Lighting.
HID (High Intensity Discharge) Lighting creates EMI problems.
LED is a cold light source (with none UV and FIR) and does not pollute the environment.
All HID Lamps have a light-derating after 2.000 operation hours
LED does not have any derating up to 50.000 hours @ 20°C Tamb.
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