LED FAQ

LED FAQ

1. What is LED lighting? Does it save energy?

LED stands for light-emitting diode, which is a semiconductor light source that emits light when a current flows through it (a structure designed to emit light). All LED light sources provide energy savings and are designed to replace older luminaires that use incandescent, halogen, fluorescent, metal halide and high-pressure sodium lamps. LED technology allows for this reduction in energy consumption by converting up to 95% of the energy into light. LED lighting also create brighter light  using less power. By choosing LED lighting, electricity consumption c40% to 80% of electricity, depending on the choice of luminaire. LED diodes have a service life of 100,000 hours or more; therefore, you can forget about the maintenance of the lighting system for a long period of time.

2. What to look for when choosing LED luminaires – watts or lumens?

Always rely on the lumens. The watts indicate how much energy is needed to produce a specified number of lumens. Therefore, it is important to pay attention to the lumens per watt (lm/W). If more lumens that can be extracted from 1 watt, it means that less energy will be necessary to produce the light. You will notice that certain LED solutions use less energy to emit the same amount of light. Therefore, a higher the lm/W value correlates with a more efficient luminaire.

3. Which LED system components are most likely to break?

Tai daug priklauso kaip suprojektuotas LED švietuvas, bet didžiausia rizika yra maitinimo šaltinis nes tai yra sudėtingas ir jautrus (temperatūrai bei įtampos pokyčiams) elektonikos įrenginys. Todėl labai svarbu pasidomėti, kas yra jūsų pasirinkto LED šviestuvo maitinimo šaltinio gamintojas ir kokio, ilgaamžiškumo, skirtas kokiems temperatūros rėžimams, kainos lygio gaminys. Paprastai patikimesni maitinimo šaltinis turėtų tarnauti daugiau kaip 70,000 valandų (prie tc = 70 °C, priklausimai kokia yra švietuvo darbinė temperatūra kritinėse vietose (po 2 švietimo valandų)).

4. What is the most common cause of an LED failure?

Heat is the biggest enemy of electronic systems. Typically, a higher heat results in a shorter service life. However, with the right housing material (aluminium is often chosen due to its high thermal conductivity) and an appropriate design, it is possible to create a reliable luminaire that will be resistant to high temperature environments. Typically, a luminaire with an external power supply can last longer than a luminaire with an integrated system.

5. What is CRI?

CRI is a colour rendering (reproduction) index. Whereas the lumens reveal the amount of light emitted by a lighting product, the CRI indicates  quality of that light. The CRI is measured on a scale from 0 to 100, where 0 indicates the worst and 100 the best quality. The CRI index of LED luminaires usually lies between 75 and 95. A higher CRI generally means that the LED luminaire, and consequently the entire product, will be more expensive.

6. How many lumens are required to replace a 400 W metal halide used in a high-ceiling room with an efficiency of 43-70 lm/W?

The efficiency of our LED luminaires is 175 lm/W. To replace a 400 W luminaire, a 150 W LED luminaire with high-quality optics that concentrates light in the right direction will be correspondingly required; however, 92W might also suffice.

7. What light colour temperatures are available in LED lighting?

The colour temperature of a luminaire is measured according to the Kelvin scale. LED bulbs come in a variety of colours, but the most common range from 2700 K to 7500 K. Many manufacturers like to use terms such as day white, natural, white, warm white and cold white – but there is no standard that links the Kelvin scale to these terms. Thus, the Kevin scale is the only consistent way of measuring the temperature of the light. A warmer light will have a yellower tone, while in a colder light more blue tones are present.

2700-3200 – WW – warm white

4000-4500 – NW – natural white

5000–5500 – DW – daylight white

6500-7500 – CW – cold white

8. How much money will I save by changing to LED lighting?

It depends on the individual luminaire, as they can have fluorescent lamps, metal halides, etc. However, a 70% + reduction in electricity costs frequently results.

9. What do LED lights consist of?

The LED luminaire consists of 3 main components: an LED module (a set of chips that emit light), a power supply (to convert the voltage and stabilise the current) and a cooling radiator or specially designed housing (to provide cooling). The radiator (housing) distributes heat from the LED diodes and the driver. The heat output from the LED modules and power supply needs to be properly controlled to ensure a longer service life. In addition, LED diodes convert electricity into light more efficiently than other light sources. As a result, a 150-90 W LED luminaire is sufficient to replace a 400 W metal halide luminaire.

10. Why do some LED luminaires last longer than others?

Not all LED luminaires are designed in the same way. Over time, the light output of all luminaires will decrease, but unlike incandescent bulbs, LED diodes do not burn out. Instead, they gradually lose their brightness after thousands of hours in operation. LED luminaires are considered to have expired when they reach 70% of their initial light output. The lifetime of a high-quality LED luminaire can be from 50,000 to 100,000 hours. Nonetheless, the exact lifespan of the LED diodes depends on several factors. For example, heat is generated in the LED module, and an improper distribution of that heat can shorten the lifetime and the  light quality of the LED diodes. The manufacturers of top quality luminaires have developed solutions and components that will efficiently distribute the heat that accumulates in critical areas of the luminaire. Some manufacturers also “intensify the current and overload” the LED diodes in the initial stage of use (one of the signs of this practice may be a low lm/W value of 100-120 lm/W), which results in higher brightness at the beginning of the service life but a shorter lifespan as well as changes in the light temperature (after a short period of time the light becomes greener or bluer). In addition, the manufacturers who claim that their LED luminaires will last 100,000 hours may only be partially right, as they typically rely on laboratory tests that are performed on the LED module but not on the complete LED system.

11. How can the light colour temperature change function be useful for retail trade and product displays?

The range of goods in a store typically changes along with the seasons. Therefore, the colour change feature can be useful for adapting the colour of the lighting to a range of products. Electronic goods, for example, will look better in cold white lighting; while fabrics need a warm light shade. You can also use lighting variations to highlight the most fashionable colour of the season using the LED colour-changing options.

12. How does LED lighting help reduce CO2 emissions?

In general, LED diodes use less energy to produce the same level of lighting compared to traditional halogen and fluorescent lamps. Therefore, the total annual kW/h consumption is lower, which helps reduce the overall CO2 emissions and lower the air pollution.

13. Why is the LED considered an environmentally friendly technology?

LED diodes are more efficient than most other light sources because they typically use less energy to achieve the same result. Moreover, they do not contain hazardous substances such as toxic mercury. In addition, the service life of LED diodes is longer, which reduces the quantity of lamps that end up in disposal sites. LED luminaires also are fully recyclable and their components are not toxic to the environment.

14. What types of LED optical systems are available?

Primary systems with integrated lenses.

Systems featuring secondary optics in the form of lenses, reflectors or diffusers.

There are several different types of secondary optics; however, the main ones are:

  • wide-angle scattering optics for the illumination of large spaces;
  • narrow-angle scattering optics that are suitable for general lighting;
  • asymmetric scattering angle optics that are suitable for street and warehouse rack lighting;
  • very narrow-angle scattering optics that are suitable for accents and corridor lighting.

Different beam angles can be created with the help of lenses and reflectors. Narrow angle optics with an angle of 30° produce a focused and concentrated light beam that is suitable for a floodlight. However, wide beam angles, such as a 150° angle, produce greater coverage for the illumination of large areas. They are all designed to change the path of the light in a concrete and controlled way, in order to create different effects.

15. Is it true that LED diodes do not emit heat?

No. It is true that the rays of a LED-based luminaire are not warm. However, the diodes themselves emit heat, so the luminaire can even feel warm or even hot to the touch.

16. What does dimming mean?

This is a feature that improves the lighting condition with the help of sensors. The main advantage of this system is the ability to detect daylight or movement, and in this way it can save energy and reduce your costs.

17. What is DALI?

DALI stands for a Digital Addressable Lighting Interface (DALI). It is a technical standard for lighting controls in buildings and homes. All devices connected to the DALI bus are addressed, resulting in an excellent standard for autonomous lighting systems. Some DALI controllers can be integrated into the systems based on other communication standards (DMX, KNX), which can be controlled by a computer, smartphone, tablet or another smart device.

Skambinti