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95
The Lighting Handbook
Light emitting diodes (LEDs)
– Very efficient light production
– Wide selection standard ranges
– Can switched and dimmed required
– Very long service life
– Good very good colour rendering
– Very good production coloured light
–
Use: LEDs can used for both functional
and decorative lighting indoor and
outdoor locations. 250 micrometre =
1 one thousandth millimetre). Actual
coloured light produced, depending on
which materials are chosen.
Functional description
Light emitting diodes are modern semicon-
ductor devices. The smallest LED chips have side
length approx.
They are completely superseding traditional
light sources many applications. mix-
ture RGB (red, green, blue) also produces
white. Nowadays, high-
quality white light produced blue LEDs
with yellow luminescent substances.
. Their very long service life over
10000 hours demands optimised thermal
management order prevent overheating. Their characteristics are
determin
ed their materials, mechanical
design and operating mode. The active semi-
conductor layer, which radiation pro-
LED lamp LED module
Board
LED chip
Bubble
Bonding wire
More information about LEDs can be
found Chapter Technology. rule,
they are powered via appropriate convert-
ers.
Today, LEDs are already some the most
efficient light sources for general lighting.
duced, sandwiched between positive and
a negative substrate inside the LED
