What does a 50,000 hour lifespan mean for LED lighting purposes?
50,000 hours means 5.7 years lifespan on the assumption that the light is switched on 24 hours a day; 7.6 years if the light is switched on 18 hours a day and 11.4 years if the source is switched on 12 hours a day.
Does the increase in power means an increase in the luminous flux emitted by LED products?
An increase in power in watts translates into a slight decrease in efficiency. A 3W LED light source will emit slightly less light than three 1W light sources. In general, the characteristics of components (e.g. optics, heat sink, chips, LED modules and driver) have a greater impact on the light output than the wattage output.
What are the economic benefits of using LED products?
LED light sources have a longer life span, which reduces their maintenance and replacement costs . Since LED products need to be replaced less often, the user spends less time on buying new lamps and replacing them. LED light sources consume less energy than conventional light sources. Investment pays for itself quite quickly.
What are the benefits of LED technology?
The use of professional LED lighting is means predominantly energy-costs saving, comfort of use and protection of the environment. Below is a short list of advantages of using LED lighting:
- Saving energy
- Durability - the lifespan of LEDs is can be 50,000 hours of continuous illumination, which means that at the same time you would have to use 50 ordinary incandescent bulbs.
- Decorative lighting - thanks to the use of multicolor lighting and unique designs, it has never been so easy to obtain interesting illumination effects in the illumination of our spaces. Thanks to LED technology everyone can create individual decorative illuminations.
- Safety - professional LED light sources do not produce UV radiation which means that continued exposure to LED light sources is completely safe.
- Efficiency - LEDs are currently the most energy efficient source (using much less electricity) than traditional light sources.
- Impact resistance, temperature - in contrast to traditional lighting, the advantage of LED lighting is the fact that it does not contain fibres and glass elements that are very sensitive to impacts and shocks.
- Heat dissipation - LEDs, compared to traditional lighting, generate small amounts of heat energy due to their high efficiency. The energy produced is mostly converted into light (90%), which allows for prolonged periods of operation.
Are LED light sources more durable than traditional sources? If yes, how significant the difference is?
As commonly accepted, LED product lasts four times as long as a compact fluorescent lamp and 25 times as long as a conventional incandescent lamp that generates the same amount of light.
How to determine a “flicker free” index
The flicker free label can be applied to a product on the basis of three separate measurements taken using GL Spectis 1.0 + flicker equipment supplied by the GL OPTIC brand.
Flicker index: its value shall be below 0,1.
Flicker percent: it value shall be below 0,0333 x Hz (flicker frequency).
The above conditions to be satisfied are suggested by the IEEE organization , known as: "no observable effect level".
Example of how to calculate the flicker value based on a selected Flicker report.
SVM (stroboscopic visibility measure) must below 1.
If all three conditions are fully satisfied, the device is labelled “flicker free".
Which power supply to choose for LED strips?
Each lighting system using LED strips requires a power supply with appropriate amount of power for proper functioning.
NOTE: In order to ensure durability of the LED lighting system, it is necessary to choose the wattage of the power supply which is at least 10% higher than the required power for the given section of LED strip. This guarantees that the PSU will not be overloaded, which translates into its durability and reliability.
The below tabel should help you to choose the appropriate PSU for your LED strip:
Type of LED Strip:
300 LED 5630
Power of PSU
(7,2 W / mb)
(9,6 W / mb)
(18 W / mb)
(14,4 W / mb)
The above table takes into account the necessary power reserve of the PSU
How to connect two sections of LED strips with each other?
The best way to connect two sections is to solder them in a designated spot. An alternative is to use quick-mount connectors, suitably adapted to the type of LED strip to be soldered.
Warm white or cool white colour temperature? Which one to choose?
Some types of lighting can cause tiredness, create a sense of relaxation or deliver a sense of energy. In order to describe the colour of light we shall focus on the colour temperature measured in Kelvin SI unit.
Here is a brakdown of LED lighting according to the color temperature scale (CCT):
- 2500 - 2900K - Very warm light creates a mood of relaxation. Recommended for quiet and private spaces where a cozy and relaxing climate is to be created.
- 3000 - 3500K - Warm light which adds coziness. Very popular range, willingly chosen for apartments and houses. It gives a pleasant, quite warm light. It adds coziness to the interior.
- 3600 - 4000K - White, daylight, neutral light maximising concentration. This colour temperature is ideal for general applications. It can be used in offices, homes, kitchens and bathrooms. This colour is ideally suited for use in the workplace.
- 4100 - 5000K – cool shades of white colour. Ideal for use in offices and public spaces. This LED light colour has a stimulating effect. Cool lighting is more formal and energetic. It improves concentration and boosts up energy.
- Above 5000K - highly cool white temperature ideal for professional use. It is a great match for business purposes, corridors, garages and parking lots. It can also be used as decorative lighting.
Methodology of photometric tests - LM79-08, LM80-08, TM21-11
The LM79-08 is an IESNA approved standard for the measurement of complete luminaires at the LED line® Light Research and Measurement Centre. It guarantees uniform and correct measurements of light and electrical parameters. Using the LM79-08 standard, we are confident that the measurements are always taken under the same conditions and that the compatibility of the measurements is the same in all laboratories.
The testing methodology included in the standard specifies both electrical and photometric measurements carried out under specific conditions and parameters. At the LED line® Light Research and Measurement Center photometric measurements are performed in Ulbricht integrating sphere in accordance with the LM79-08 standards, which requires measurements of the total flux of light, CRI color characteristics, CCT, chromaticity coordinates, electrical parameters and light efficiency. During the measurements it is necessary to ensure the tests are performed in an ambient temperature of 25°C with a tolerance of +/- 1°C and to limit the air movement during the measurements. The AC power supply must provide a harmonic distortion limit of 3%. In addition, measurements should start after the luminaire has been warmed up for 30 minutes. LM79-08 standard also refers to measurements in gonio spectrometer, where additional measurement of light distribution is performed.
A separate LM80-08 – standard - is used for LED light sources without built-in power supplies. According to its requirements, the luminous flux and chromaticity coordinates must be measured at three levels where the temperature of LED/housing connection reaches: 55°C, 85°C, and the third temperature value is specified by the LED manufacturer. Measurements are made for a period of min. 6000 hours with intervals of no more than 1000 hours. The results of the measurements allow to observe how the diode changes its light parameters during the test. Please note that the LM80-08 standard only provides a method for testing the maintenance of the luminous flux.
Estimation of LED source durability/degradation is provided by TM21-11, which uses the LM 80-08 test standard. Based on the test, estimation of light flux loss during 36,000 hours (6k) (or longer if the test is longer than minimum) is made. The test result is recorded as e.g. L70, where 70 means that the LED will maintain a luminous flux of 70% of the initial value after a period of 36,000 hours (6k).
In summary, it should be remembered that the LM79-08 standard applies to complete luminaires and light sources equipped with power supply systems. LM80-08 tests are performed on a single LED or a set of LEDs without power supply systems in order to determine the loss of light flux by using calculations determined in TM21-11 document.