Frequently Asked Questions

What is LED?

LED or Light Emitting Diode is a combination of semi-conducting materials (eg.Arsenic, Gallium, Indium, etc) discharged onto a “film” of phosphorus in such a way that once voltage is applied light radiation is emitted.

What kind of lamps are those used to date?

The types of lamps we have had so far were incandescent lamps and mercury lamps (the conventional fluorescent lamps in our business offices and the energy-saving lamps in our residences).

And what are the advantages of LED lamps compared to the conventional lamps?

As a new technology, LED lamps have significant advantages, such as:

  • Low consumption
  • High luminous efficiency
  • Low temperature operation
  • Great lifespan

When you say low consumption, how much energy is saved in comparison with the conventional lamps?

In the following table we list some basic correspondences in consumption between conventional lamps and LED lamps.

Incandescent lamp Screwed 60 Watt 5 Watt ~ 91%
Spot 50 Watt 7 Watt ~ 86%
PAR/AR111 75 Watt 9 Watt ~ 88%
Mercury lamp Screwed 21 Watt 10 Watt ~ 52%
PL 26 Watt 11 Watt ~ 57%
Fluorescent lamp T8 60cm / 18Watt 10 Watt ~ 50%
120cm / 36Watt 18 Watt ~ 58%
150cm / 58Watt 25 Watt ~ 65%
Road Lights HPS 125 Watt 56 Watt ~ 57%

(The energy-saving percentages are based on actual consumption)


Apart from the benefits on consumption, what are the other advantages of LED lamps?

LED technology is the friendliest technology to humans and the environment because:

  • It has a better color rendering index than conventional lamps
  • It does not emit ultraviolet (UV), infrared (IR) or Electromagnetic (EM) radiation
  • It does not contain mercury, lead or other toxic substances that pollute the environment
  • The basic materials are aluminum, plastic and glass which are 100% recyclable.


How can I choose the right lamp? Are there any special technical features?

The main technical features of LED lamps are:

  1. Power: in Watt (W)
  2. Luminous efficiency: in Lumen (lm)
  3. The light output/power ratio: in Lumen/Watt (lm/W)
  4. The color-rendering index (CRI)
  5. The origin of LED lamps
  6. The type of power supply
  7. The metal of the brush
  8. The lifespan
  9. The guarantee period


What does guarantee means? What does light output decline means?

The term guarantee means that if any failure occurs in the lamp (even one burnt out LED), the lamp will be replaced with a new one.

Like all types of lamps, LED lamps lose some of their original brightness over time. However, other types of lamps that do not have the features listed above lose much more of their efficacy, much sooner (more than 15% within 6 months).