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Introduction to LED |
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Your right business
partner DSTiTAC BV |
What is LED |
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▪ New
Technology |
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The lamps that have been used since
the invention of the incandescent light bulb some 130 years ago are finally
becoming obsolete with the rapid development of LED, Compact Fluorescent and
HID light sources. ▪ What are the advantages of using LED
lighting? LED¡¯s can
have exceptionally long lifetimes with up to 50,000 hours of useful life
(although time to complete failure may be much longer.) This drastically
reduces maintenance costs especially compared to halogen luminaires.
Fluorescent tubes are typically rated at about 10,000 to 15,000hours and
halogen lamps at 1,000 to 2,000 hours. LED¡¯s are far more efficient and produce
more lumens per Watt than halogen lamps. Due to
the complete lack of ultraviolet (UV) radiation and infrared (IR)radiation, LED is ideal for display lighting as it does
not radiate heat in the direction of the illuminated object, it can therefore
be used to illuminate materials that fade easily - food, works of art, etc. As LED¡¯s
are solid state components, they are resistant to damage by impact shock or
vibration unlike fluorescent and incandescent lamps which are fragile. LED¡¯s
are ideal for use in applications that are subject to frequent on/off
switching, whereas fluorescent lamps which can burn out quickly when switched
frequently and HID lamps require several minutes before re-starting.LED¡¯s light up very quickly, typically in
milliseconds. Dimmable and RGBcolour changing
versions are also available for flexibility and control in any lighting
application. ▪ In what applications can LED
lighting be used? Display lighting where halogen may fade
sensitive materials. Underwater lighting where a low voltage supply for
safety is required. Outdoor lighting where colored effects are desired to enhance outside
spaces. Sign lighting, LED strips can be used to light signage in many different colors. Low
level lighting where halogen light sources may pose a danger
to touch due to high temperatures. Architectural lighting where LED¡¯s can be used in applications which traditionally
used expensive and inflexible neon or cold cathode light sources. ▪ Will LED technology save you money? With todays spiraling energy costs the end user will
appreciate lighting cost savings of up to 70% per annum with energy saving
LED products compared with halogen lighting. The added benefit of reducing
CO2 coupled with a complete absence of Mercury in LED¡¯s, unlike fluorescent
lamps, makes LED technology environmentally friendly. ▪ LED (Light Emitting Diode) A diode is a component that allows
an electric current to flow in one direction, but blocks it in the opposite
direction. An LED is a diode
which emits light when an
electric current passes through it |
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LED¡¯s are
solid state semiconductor devices.
LED illumination is achieved when a semiconductor crystal is excited so that it directly produces visible light in a desired wavelength
range (colour). LEDs are
small, typically 5mm. The light
from an LED is practically a pure, single color. A green LED produces green light
only, a red LED only red light, and so on. It is the material of the LED chip
that determines the color. LED¡¯s are
driven by direct current, and the amount of current determines the
brightness. The
brightness of the LED is proportional to the current flowing through the LED, more current, more light. In order to
create a full range of colors
including white light, we need to use a selection of different colored
LED¡¯s that can be combined in various proportions
to create a wide color pallet ▪ Features
& Benefits of LED ¡¤ LED¡¯s are extremely efficient low energy light sources ¡¤ In 2005 white LED¡¯s had reached outputs of over 30 lumens/Watt
and colored versions 50 lumens/Watt. The light gains continue to grow,
doubling about every two years ¡¤ Long operational life of up to 50,000 hours ¡¤ Compact light source, no other lamp possesses such small
dimensions for a comparative light output ¡¤ LED¡¯s do not emit ultraviolet (UV) or infrared (IR)
radiation. They do not radiate heat in the direction of the illuminated object, they can therefore be used to illuminate materials
that fade easily, food, works of art etc. ¡¤ LED¡¯s are durable against impact and vibration ¡¤ LED¡¯s can be dimmed ¡¤ Colored light can be produced effectively - over 16
million colors ▪ Common
Applications ¡¤ Display lighting - compact displays are possible with
low operating temperatures ¡¤ Display case, museum and shop lighting - illumination
of sensitive objects at close range with ultraviolet (UV) and infrared(IR)
free light ¡¤ Underwater lighting - low voltage supply for safety and
low maintenance ¡¤ Outside lighting - colored effects to enhance outdoor
spaces ¡¤ Sign lighting - strips of LED¡¯s can be used to light
signage in many different colors ¡¤ Low level lighting - LED luminaires
are cool to touch and are therefore suitable for us in domestic situations
where children may come into contact with them ¡¤ Architectural detail lighting - LED¡¯s can be used in
applications which traditionally used neon or cold cathode ▪ LED
Color Variation Due to the
manufacturing process of LED¡¯s they are graded into ¡®Bins¡¯ of like color
temperature. Even within these ¡®Bins¡¯ it is impossible to guarantee the color
temperature of the light. This
color variation can be discernable to the human eye
and this should be taken into account when designing lighting plans using LED
technology. ▪ What is
RGB? RGB stands
for red, green
and blue. It is a commonly used
term to denote a module or luminaire that has the ability to change color, up to a maximum of 16 million
variations depending on the controller Features include color phasing,
switching and static colors ▪ Choosing The Right Light Source
To suit the demands of today¡¯s
varied lighting installations, fittings are being designed with a growing number
of different light sources - each creating a different environment. Choosing
the right light source for the right application is critical. Low Energy, LED, Halogen,
Fluorescent, or HID lamps are all available in a variety of wattages and
colors See below for our quick start
guide to choosing the right light source for your installation. The two columns to the left of
the lamps help to give you a better understanding of how powerful the lamp
light is (Light Intensity Rating) and how efficient the lamp is (Efficiency
Rating).
About Ormrod
Lighting & Electric |
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Originally known as Stanwall Electric until 1986, Ormrod
Lighting & Electric is now the pre-eminent electrical
wholesaler of residential and commercial lighting in West
London with lighting showroom facilities and electrical and lighting
trade counter at 173/175 Chiswick High Road |
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General contact: info@dstitac.com
What is LED, LED T5
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