Although, LED's that produce a certain spectrum of visible light have been under development from the 1960's, only until recent 5 years have LED's that can produce light at the levels of illumination - for a main lighting source in a home or business - seen mass production. The steps of innovation in the LED illumination industry, also known to as Solid State Lighting (SSL), is currently progressing at an amazing speed. The latest lights available from sounded impossible 3 or 4 years ago!
ADVANTAGES /
BENEFITS / CHARACTERISTICS OF LED
1. Environmental Friendly (No RF
interference):
• LED has no hazardous content such
as Mercury, which if leaked from CFL
is harmful.
• LED lamps emit no Infrared or
Ultraviolet radiation which is
harmful to human.
• LED typically is RoHS compliant,
meaning that they have no or at most
negligible amounts of hazardous
substances within the scope of that
compliance (Lead, Cadmium,
mercury…).
2. Long Lasting:
• If left on continuously, LED has
an estimated rated lifespan of at
least 50,000 hours (about 5 years).
• If left on for about 12 hours a
day, LED has an estimated rated
lifespan of about 100,000 hours
(about 10 years).
• It is more long-lasting as
compared to the CFL (Refer to Table
3 at Page 13 for a comparison of LED
lighting and traditional lighting).
3. Major reduction in power
costs:
• LED reduces electricity usage by
about 70% as compared to CFL and 80%
compared to Halogen Light.
4. Low power consumption, high
intensity Efficiency:
• LED generates low wattage but
does not compromise on light
efficiency.
• With low heat emission, it
decreases load on Air-Conditioning
• LED produces more lumens per watt
of energy as compare to CFL.
5. Maintenance free, easy
installation (Durability):
• LED has no fragile filament or
tube. Even if you drop the LED, it
will not shatter into pieces.
• In addition, LED suffers no
degradation in performance if
switched on and off frequently,
unlike CFL.
6. Less wastage of light:
• LED lamps have better control
over the direction(s) in which their
light is emitted. This is
advantageous in applications where
you only want the light to go in one
general direction (Unidirectional)
rather than in all directions (omnidirectional).
• Think of recessed ceiling lighting
where any light not directed
downward is wasted. LEDs tend to
generate light in one direction. By
using lenses in the LED lamp, this
light can be spread out to achieve
various specified beam angles.
• To do with incandescent or
fluorescent light sources, which
emit light in all directions, a
reflector must be used (the 'R' part
of 'PAR38' for example), and these
reflectors are never perfect,
causing some light loss in the
process. This further increases the
efficiency advantage of LED lamps
over traditional light sources.
7. Speed:
• LED turns on instantly
(reaching full brightness
immediately). It lights up quickly
in micro seconds compared to other
light source.
• CFLs tend to have a warm-up period
which may range from a few seconds
to over a minute. During this
warm-up period they may not be as
bright as they will eventually
brighten. This can lead to
disadvantages ranging from having to
wait for light levels to increase to
a useful level, wasting time and
electricity, to turning the lights
on before you really need them, in
anticipation of the warm-up period,
wasting electricity.
8. Effective in Temperature
change:
• LED lamps can be used in
colder temperatures than CFLs.
• Most CFLs will not turn on or will
only emit very low levels of light
in the cold (near freezing).
9. Solid-state and
vibration-resistant:
• Different from the tube of
conventional lamp which is made of
conventional glass, the tube of the
LED lamp is made of acrylic. So it
is very solid and hardy and will not
be broken even if it falls on the
floor.
