The wave-
length the light depends the semicon-
ductor material and its doping.g.
– CoB (chip board) LED: the LED chip is
mounted directly the printed circuit
board. mercury)
– Resistant vibrations and impact
– Saturated colours
– Immediate start, i.
Basically, there are three types LED:
– Standard through-hole LED: often used as
indicator light source, although with low
light output.72
The Lighting Handbook
Functions and types LEDs
An LED (light-emitting diode) electronic
semiconductor component that emits light
when current flows through it. This allows dense arrangement of
chips close each other. Due their shorter service
life, higher probability failure and sensi-
tivity radiation, they are not used in
lighting technology. The spectrum
of LEDs offers major benefit: only light
(electromagnetic radiation the visible
range) and ultraviolet infrared radiation
is emitted.
Basically, consists LED chip pro-
tected silicon coating mounted on
a housing ceramic plate with contacts. 100% luminous flux
after switching on
– ignition, boosting cooling time
– High-precision digital dimming
– shifting colour locations during
dimming
– Luminous flux and service life greatly
dependent temperature (increase at
lower temperatures)
LED technology
.
– SMD (surface mounted device) LED: LED
that reflow-soldered the surface a
printed circuit board (using reflow oven).e.
LED features
– High efficiency high luminous efficacy
(lumen/watt)
– Long service life
– Broad spectrum white light
(warm white daylight white)
– infrared radiation
– Compact size
– Good excellent colour rendering
index (Ra)
– Luminous flux and service life highly
temperature-sensitive
– environmentally harmful materials
(e
