Frequently Asked Questions
Welcome to our Frequently asked questions (FAQs)
There are lots of questions concerns LED Lighting fittings here, so we have grouped them into different headings. If you don't find the answer in one section, try another similar one. or contact our team members for help.
Why is LED technology classified as solid state lighting?
The term solid state lighting is used because the electronics produce light directly from solid materials in which the electrons are embedded. This is unlike other technologies, for example fluorescent technology, which requires a gaseous discharge medium to initiate production of light.
What makes LEDs more robust than other light sources?
LEDs have no gases, filaments and no moving parts to fatigue. They provide light through a one-step process that takes place within the diode. There is no glass to break or screwed contacts to loosen.
Why do LEDs have a higher initial cost than conventional light sources?
LEDs are made of electronic components that need to be packaged together to offer long lasting efficient light sources to the end user. Apart from the LED chip itself which has sapphire and gallium in the semiconductor, the process of packaging with materials like ceramic, rare earth phosphors, silicone, solder and gold wire add to the overall cost. White LEDs require further tests for calibration and standardization.
What are the economic advantages of using LEDs over conventional light sources?
Although the initial cost of conventional light sources is less than LEDs, the operational and maintenance costs of LED are significantly lower. LEDs, having a longer life, reduce maintenance and lamp replacement cost. . Because LEDs need to be replaced less frequently, the owner spends less on new lamps and the labor needed to change them. LEDs also consume less energy; thus the overall cost of a LED system can be significantly lower than that of conventional lighting systems. Most applications with LEDs offer a payback period as low as three to four years.
Can I use LEDs in a green house?
Note that the light output of LEDs lessens at higher temperatures. You should make sure that the luminaire is suitable for the environmental conditions.
Is it true that LED lights do not attract insects?
Most insects are primarily attracted to Ultra-violet rays, which help them forage, navigate and select mates. For example, Indian moths are attracted to UV-365nm and green light-500nm. LEDs do not have UV content and hence do not attract many insects compared to conventional light sources.
How do LEDs keep food fresher than conventional light sources?
LEDs do not emit ultra-violet light and do not carry heat in the beam, unlike their conventional counterparts. This helps keep food fresher in refrigerators and cold stores.
What are the advantages of LED over neon in signage applications?
How can the color changing ability of LEDs be advantageous in retail and display environments?
In retail and display environments where the range of products change by the season, the colors can be changed to match the type of product on display. For example, electronic goods may require a cool white light while a warmer tone may be required for fabrics. When a fashion season has red as a theme, the store can utilize a color of light with more red in its spectrum to enhance and bring out the vibrancy of the display.
Can LEDs help to improve performance in classrooms?
LEDs have the capability to offer “biologically optimised” solutions that simulate the color temperature of the sky. This have been proven to improve concentration and maintain alertness of students in classrooms. It has successfully dealt with a kind of morning tiredness in mostly observed in young people. One way of creating the appropriate color temperature is by using a combination of independently controlled blue and white LEDs.
What are the benefits of using LEDs in mining areas specifically?
What are some of the uses of LED colored lights in the defense industry?
Green LEDs of wavelength 495nm along with red LEDs are useful for military pilots who have special devices that are made for night vision. Blue LEDs are useful for pilots who need to read maps at night. Special infra-red LEDs are used to light areas at night without making the target aware that they are being viewed. This is facilitated through special IR night vision equipment.
Why are LEDs advantageous in lighting underground caves?
Underground stalactites are damaged by the heat of halogen lamps. LEDs, with their long lifecycle also require much less maintenance than traditional light sources.
White light & other colors
How is white light produced by LEDs?
What are tunable white LEDs?
Tunable white LEDs are light engines that combine individual chips to produce a range of CCT from warm white and cool white.
How is colored light produced from LEDs?
Why do LEDs produce more vibrant and saturated colors than conventional lamps?
LEDs emit a very narrow spectrum of light. The type of material used in the semiconductor permits only a specific wavelength of light (one color) to be emitted when electrons cross the junction.
What does RGB LED mean?
RGB LED means red, blue and green LEDs. RGB LED products combine these three colors to produce over 16 million hues of light. Note that not all colors are possible. Some colors are “outside” the triangle formed by the RGB LEDs. Also, pigment colors such as brown or pink are difficult, or impossible, to achieve.
What are the different types of RGB LEDs?
How is Amber produced?
This is a phosphor - converted Amber LED. Amber uses special phosphors in combination with royal blue LED chips.
What does correlated color temperature, CCT, mean?
Color temperature(CCT) defines the color appearance of a white LED. CCT is defined in degrees Kelvin; a warm light is around 2700K, moving to neutral white at around 4000K, and to cool white, at 5000K or more. Note that CCT does not tell you anything about the color rendering ability of the LED.
What are the standard comparisons used to evaluate the color quality of light sources?
In what contexts do R-9 values of CRI of LED lamps become important?
CR-9 represents red tones, which are prevalent in skin tones, clothes, vegetable and meat. For make-up rooms, supermarket and grocery meat and vegetable counters, if the same visual freshness as seen with halogens and incandescent lights sources is required, looking into R-9 values of LEDs is a must. Usually, gallery owners and artists will easily note the difference in effect when red tones are prevalent in the art work.
What is the SPD of a light source?
SPD is the Spectral Power Distribution of a light source. The visible white light that we see is made up of a spectrum of various colors of light, ranging from wavelengths of 380nm (violet) to 760nm (red). The SPD is a graph that shows the power (strength) of each wavelength of light produced by a particular light source.
What quality processes guarantee the consistency of the color appearance of LEDs?
LEDs are standardized for consistency in color and performance through a process called binning, and they are classified further in the MacAdam steps. During the manufacturing process LEDs are allocated to specific 'bin' numbers based on tests conducted to determine their color, lumen output and forward voltage. LEDs from each bin are further classified in a 7-step MacAdam ellipse.
What other parameters can be used to evaluate the color quality of light?
Why do some white LEDs start emitting an almost bluish tone over time?
The white LEDs are made of phosphor coated blue LED chip. The degradation of the phosphor layer over time causes the bluish tone of the light emitted. This degradation is most likely to be caused by the chip running too hot. Remote phosphor technology overcomes this issue.
Why has the color appearance of the LEDs changed after a period of use?
New LED Light source Life span & Output
What are the core components of a typical LED that gets soldered to a Printed Circuit Board?
Do LEDs require time to reach maximum brightness?
What does a life of 50,000 hours mean in the case of - LEDs?
Why is the life of LEDs measured as lumen depreciation?
What are the factors that affect the lifespan of the LEDs?
Is lifespan reduced if the LEDs are frequently turned on and off?
How much longer does an LED last than a conventional light source?
What is the best way to compare the output of LEDs with other light sources?
Does increasing the wattage of LEDs increase their output?
Why are LEDs considered more efficient than conventional light sources?
What are “cold” and “hot” lumens?
How are LEDs different from other light sources in the way they produce light?
What are O-LEDs?
What are the characteristics of O-LEDs that make them different from other light sources?
What are some new uses of LEDs that have appeared with the advent of OLED technology?
Power supplies/LED drivers
Why do LEDs require power supply / drivers?
LEDs are low voltage devices. Therefore, they require a device / Power supply unit / driver, or integrated electronics that convert line voltage to low voltage in order to run the LEDs. Sometimes The driver has electronics that can interpret control signals to dim LEDs.
What are the different types of LED power supplies / drivers?
How do I know which type of driver is required by an LED product?
The LED rating of a product is usually noted in milliamps, mA or volts, V. Products rated in mA can be used with a constant current driver, while those rated in volts can be run with a constant voltage driver. LEDs designed for constant current drivers cannot run with constant voltage drivers without damaging them.
What sort of applications are constant current drivers typically used for?
What sort of applications are constant voltage drivers typically used in?
What is the maximum permissible distance between an LED product and a remote driver?
What are the advantages of 24V LEDs over 12V LEDs?
Can mains voltage LED products be dimmed with traditional incandescent dimmers?
What are the advantages of dimming LEDs?
What are the various control protocols that can be used for dimming LEDs?
Why do some LEDs flicker when dimmed or turned off?
What precautions are to be taken when mounting LED drivers?
LED Light Housing/Fittings
How is light produced in an LED?
Why is the heat sink design critical for the performance of an LED fitting?
What heat transfer techniques are used to cool LEDs?
What is the two-phase heat exchange technique of cooling LEDs?
What is junction temperature?
What are the different types of optical systems for LEDs?
Why are lenses preferred over reflectors for many LED luminaires?
What are the different ways in which luminaire design can help reduce glare from LEDs?
What are the common challenges or problems that occur when using LED fixtures in harsh environments?
What are the various causes of condensation within LED luminaires?
What product features should I look for when seeking LEDs for use in harsh environments?
Is it true that LEDs do not produce heat?
The LED luminaire is hot to touch. Why is this?
Dimming lighting fixtures with controllers
What is ZigBee?
Retrofit Lamps--Replacing an existing traditional lamp with new LEDs
Are all retrofits main voltage?
Are retrofit lamps all the same size?
Will the light output be the same?
Some retrofits appear a bit Cool, why is this?
What could be a possible hazard when retrofitting lamps in existing installations?
Can I put a retrofit in an enclosed or sealed luminaire?
Can linear LEDs be used as a substitute for T8 or T5 fluorescent lamps?
How to order led lights from SuperLED company ?
Bulk orders for Wholesale LED Lights & Lamps
Sample & end-user orders for Retail LED Lights & Lamps
Regular shipping metholds of LED Lights from SuperLED to clients
Shipped by Sea
Shipped by Air-transportation
Shipped by International Courier
LED Lighting Failure Modes and Methods for Analysis
Warranty, After sales and Maintenance of LED Light fittings
Industrial standards of LED Lighting fixtures
What does SMD mean?
What are the advantages of SMD over DIP LEDs?
What are the various types of LED chip packages available in the market?
What are the typical types of LED modules available in the market?
Which developments in LEDs have reduced the number of components in a system?
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