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LED stands for Light Emitting Diode. There are various types of LED like Miniature, Mid-range, Hi-power, AC Driven, etc. Different types of LEDs produce different types of efficiency, quality of life and varies in lifespan.
inLEDs uses solid-state hi-power LED chips to ensure good quality and long lasting light.
Phosphor layers are chemical coatings on LED chips that gives its colours. Colour changes are
very often caused by degradation of the phosphor layers. It is important to buy LED lights mounted with quality LED chips.
Other causes of colour change would most likely be the diffuser which is usually made of plastics that have changed colour due to degradation or aging and/or exposed to heat for over a long period of time.
InLEDs only sells products mounted with branded LED chips, some of them are; Cree (USA), Epistar (Taiwan), Samsung (Korea) and Sharp (Japan).
Solid-state hi-power LED have typical lifetimes between 25,000 to 100,000 hours and are subject to very limited wear and tear if operated at low current and low temperatures. Heat and current settings can extend or shorten the lifespan of the LEDs. It is very important that your light fixtures have good heat dispersion functions and the LED power supplies are of good quality.
InLEDs only sells well tested LED lights with functional fixtures to maximize the lifespan of every design.
LEDs have a characteristic of current-voltage; the current is dependent exponentially on the voltage. This means that a small change in voltage can cause a large change in current. LED can be damaged or destroyed if the applied voltage exceeds the forward voltage drop by a small amount as the current rating may be exceed by a large amount. Constant-current LED drivers keep the current below the LED’s maximum current rating. Some LED fixtures like GU10 spotlight includes a current-limiting resistor.
inLEDs uses power supplies from well known brands that are certified and recognized internationally.
Most failures are caused by low quality power supply units that could not control the voltage and current well (see the question above), the power supply burned itself out (poor components), and/or used the wrong voltage and/or current power supply. A typical good LED power supply (driver) should withstand 2-3 years of continuous usage. Just like any regular light source like tungsten bulbs and fluorescent tubes, it is wiser to leave the lights on for a longer period of time than turning it-on-and off multiple times. The cost of saving that little electricity will not cover the cost of your light breaking down.
CRI stands for Colour Rendering Index – a standard to compare colours against sunlight a.k.a natural light. The higher the CRI rating, the higher closer the light compared to natural light (good/high rendering property). CRI is normally taken in controlled laboratory to give a more accurate reading. The highest possible index is 100. While some specialised places like hospital, scientific laboratory and imaging production laboratory requires very high ratings, value rated above 80 is excellent for home and office use. inLeds products have CRI rating of 80 or higher to provide you with the best quality of light.
CRI stands for Colour Rendering Index – a standard to compare colours against sunlight a.k.a natural light. The higher the CRI rating, the higher closer the light compared to natural light (good/high rendering property). CRI is normally taken in controlled laboratory to give a more accurate reading. The highest possible index is 100. While some specialised places like hospital, scientific laboratory and imaging production laboratory requires very high ratings, value rated above 80 is excellent for home and office use.
inLeds products have CRI rating of 80 or higher to provide you with the best quality of light.
Lux level is a measure of how much luminous flux is spread over a given area – the total “amount” of visible light present, and the illuminance as a measure of the intensity of illumination on a surface. 500 lux might be bright enough for a home kitchen with a single fluorescent light fixture with an output of 12000 lumens, but to light a factory floor with dozens of times the area of the kitchen would require dozens of such fixtures. Thus, lighting a larger area to the same level of lux requires a greater number of lumens.
inLEDs website and catalogue does not provide Lux figures as they can be misleading because the same light can be used in many different kind of settings.
50,000 hours is very long time. Do all LED lights manage to achieve this standard? Almost all manufacturers write those big figures in product description. But what is the reality?
Reality is not always same as promising in all LED lights. Forget the warranty; one or two years are just 10% of the total working hours. What is the life after the warranty period? What if you are a commercial user?
Customer is not always getting what they expect from cheap products. So what to consider when choosing between low and high quality LED lights?
This might be weird but this is true, You can’t get good quality in very low weight product. As all LED lights require good heat dispassion, It can’t be accomplished without good amount of aluminum. Thin heat sink can provide more area with less weight, but it can’t transfer enough heat for removal. Only active (fan based) cooling provides solution to this. Some manufacturers provide 12-20W lights in very low weight that feels like plastic body. These products won’t perform well even in short period of time.
(Update July 2017) After some months of study, there are now some products which uses new thermal plastics which works well with higher efficiency LED chips that emits less heat. Beware of imitation of these plastics, as some low cost products uses low quality plastics with low quality LED chips to compensate for the cost of the products.
LED chips are manufactured by various big and small enterprises in the world. Japan and USA based suppliers make the highest quality chips for longer life and more reliability. Quality depends on materials used in making the chip. Larger chip provide more lights, good stability against current variations, but it costs more. Cheap and small LED chips provide less light and stability. Ceramic COB lights are totally different in terms of size; they use multiple small chips to provide more light and stability.
This is the heart of all LED lighting. LEDs are kind of semiconductor that needs to be driven with carefully and according to ratings. LED needs to be driven with constant current DC supply for longer life. What makes a LED driver unreliable? Low quality components and low life capacitors makes them unreliable. Non-branded, low cost LED driver use regular capacitors which work for only 1000 hours at elevated temperatures, which results in a significantly shorter life span for the entire LED light set.
Another costly thing in LED lights is rare earth phosphor. Cheaper LED lights use low quality phosphor to lower the cost. If you see the same product line with little different colors of white, it might be a sign of low quality. Maintaining same colors in white is a challenging task for LED manufacturers. Color rendering is also an important point to be considered. Cheap LED lights generally don’t have good CRI, As good CRI also requires high quality phosphor.
Many people choose LED lights as a new trend in interiors. They really don’t consider what kind of lights they need. Most of the cheap LED lights have same optics for multiple requirements. For example, a spot light can’t provide enough illumination at a workstation. Opaque cover is not always for good lighting. It might be used to hide cheap components in the light fixture.
Finally, how the LED lights are made is also important. Design, look, feel and strength need to be checked at time of choosing the LED light. If paint or powder coating is not well applied, there might be good chance that the construction inside the light fixture might be bad. Some manufacturers produce large amount of products at low cost with little regards for quality control.