What range is the input voltage usually in LED Drivers?

It generally operates at 220-240V voltage (198-264Vac with 10% tolerance). Special series with 120-277V input voltage are also available in Osram.

How long is the warranty period for LED Drivers?

Generally 3 and 5 years warranty periods are available. In Osram, there are usually products with a 5-year warranty, but specially;

– 3 years in Element series

-DALI/FIT IND Industrial type series for 8 years.

-If Osram modules and profiles are used, a guarantee of up to 10 years can be given.

-Osram drives have an option to increase the warranty period for an additional fee.

What does Flicker-Free mean? Which products are Flicker-Free?

Flicker literally means vibration. Light flickers in lighting devices are also called photometric flickers. Photometric Flicker can be defined as the instantaneous light intensity change in the light source. Photometric Flicker affects our health and is known to affect visual performance and comfort in its long-term effects, trigger migraine, cause headaches and dizziness and nausea.

Until today, lighting engineers did not pay much attention to the flicker effect. However, the inclusion of this effect in the health and safety rules and the complaints of the employees in the offices illuminated by fluorescent tubes led to action in this regard.

Flicker-Free means that the ripple value is less than 5%. At Osram, 95% of the OT FIT and IT FIT series are Flicker-Free. Constant Current Element S series is not flicker free. However, the newly released Compact Element G3 series are Flicker-Free products.

What types of DALI-enabled drives are there?

Products with 1-PMD feature

Products with 2-TouchDIM and Corridor Function

Economy type ETI DALI series drives without the above features except 3-DALI

What is Touch DIM and what is it used for?

It is a manual dimming system with a simple push button. What can be done;

-Don’t dim

Osram Push Button products also have a Memory (double short press) feature.

What is the Corridor Function?

It is an energy-saving feature of DALI drives by working with standard presence sensors (commercially available sensors) or stair vending machines. Working logic; the driver saves energy by making DIM when there is no motion, and returns to its original state by exiting the DIM when motion is detected again.

As a factory setting, it will behave as follows;
I zone ➔ Operating zone with motion, the drive operates at 100%. (A)

Zone II ➔ No motion state continues to operate 100% for 120 sec (D0).

III zone ➔ The dimming zone is shortened to 10% within 32 sec (F1). (B)

IV zone ➔ Stand-by zone, it will wait at 10% until it detects motion again.

With DALI Magis, how long and how many % will light up can be programmed as above.

Note: When used in factory settings, the drive will never turn OFF, but if programmed with DALI Magic, the time to turn OFF can also be set. (C) (zone VI)

What is dimming? What are the types of dimming?

Dimming is the ability to turn on and off the light intensity or power on the module. There are several types of Dimming features in use today. The main most commonly used Dimming features are DALI DIM, 0-10V&1-10V DIM and Astro DIM.

DALI Dimming Feature

DALI: Digital Addressable Lighting Interface. DALI is an international communication standard. The system simply consists of the user interface, processor, DALI driver and LED module.


•Each LED driver in the system is addressed.

In this way, the luminaires in the system can be controlled independently or in groups.

• The operation of the luminaires (Dim levels, working hours, energy consumption, etc.) can be monitored from the system.

•Comfort and energy savings are achieved by applying the desired lighting scenarios.

•The motion and light sensors and luminaires used in the system are dimmed, thus saving energy and extending the life of the led modules considerably.

• Regardless of the brand, DALI components work in harmony with each other.

1-10V and 0-10V Dimming Feature

It is a lighting control system controlled by a potentiometer or a controller to the 1-10V (or 0-10V) signal terminal of the LED driver. Here, the 1-10V signal voltage is generated by the LED driver and the potentiometer controls it. Signal at 10V LED module max. Level (100%), at 1V min. level (10%). It is possible to dim below 10% at 0-10V.

Astro DIM Feature

Thanks to the integrated counter, it is the ability to automatically dim 5 independent levels without the need for an additional control line and automation.

AstroDIM can also be used with a motion sensor.

Automatic programming feature according to the sunrise and sunset times defined according to the location.

How to set current in drivers?


The current setting is made by using an external resistor with the LT2 code at the end.
At the end, those who have NFC code can prepare a program on the computer with the free Osram Tuner4Tronic program, and the prepared program is sent to the driver from the computer with an external NFC device (PRH101USB or CPR30-USB).


For products with DALI feature, a program is prepared on the computer with the free Osram Tuner4Tronic program, and the prepared program is transferred from the computer to the driver with an external DALI MAGIC device.
Those with NFC feature can prepare a program on the computer with the free Osram Tuner4Tronic program, and the prepared program is sent to the driver from the computer with an external NFC device (PRH101USB or CPR30-USB).
Current adjustment of drivers that do not have DALI or NFC feature is made with OT Programmer or Potentiometer. It is stated in the product datasheets with which product it can be made.

What is Power Factor (PF)?

It is the ratio of real power to apparent power. It consists of phase shift between current and voltage in LED drivers fed from AC mains. As the power factor value approaches 1, the power losses of the system will decrease. OSRAM LED drivers have a power factor of over 0.95.

What is Total Harmonic Distortion (THD)?

THD: Total Harmonic Distortion. Normally, the current-voltage in the network is in the form of a sinusoidal curve. Harmonic is the distortions that occur in this curve. LED drivers generate harmonics due to AC-DC rectification and DC-DC conversions. As the number of LED drivers in the system increases, the THD values ​​of these drivers become more important. These harmonics in the system damage both the network and the connected devices (communication disruptions in automation, electronic card failures, compensation problems, etc.). In LED drivers, the THD value is reduced by filters.

Osram LED drivers have a THD between <5% and <20%.

What do SELV and Non-SELV definitions mean?

SELV: Safety Extra Low Voltage, that is, extra low voltage and LED drivers with output voltage DC≤60V fall into this class. They can be used in both Class I and Class II luminaires without any additional processing. They are generally used with LED modules connected in parallel.

Simple Insulation: One layer of protection against electric shock

Supplementary Insulation: Independent isolation providing protection against system failures

Reinforced/Double (Reinforced/Double) isolation: It is the type of isolation that combines simple and complementary isolation.

Non-SELV: They are LED drivers that do not have isolation between the input (primary) and output (secondary) circuits. There is only isolation between the electronic board and the drive body. Drivers with output voltage DC>60V fall into this class. It is class I due to its structure, but can be used in Class I and II luminaires. For use in Class II luminaires, extra insulation is required when mounting the driver to the luminaire. Non-SELV LED drivers are generally used with LED modules connected in series.

What is Surge Protection (ESD)?

Lightning Protection: In order for LED technology to be economical, the LED module and driver must be protected from premature failures and reach the expected lifetime. Unlike mercury vapor lamps, LEDs are designed for low operating voltages only and are therefore sensitive to high voltages. In practice, it has been observed that LEDs cannot withstand the high voltage that occurs during operation without a protection. Therefore, protection is an essential feature for LED systems. LED Lighting manufacturers have designed their LED drivers for a high voltage usually between 2-4kV. Although this value may be sufficient for interior lighting, it is insufficient for road lighting.

High voltage is a significant increase in the voltage of the system during operation. The main reasons for this situation are due to a lightning strike near or on it, or the load change on the power transmission lines.

Osram has products with protection up to 10kV high voltage. There are IND series products specially produced for Industrial applications with protection up to 6-10KV in Outdoor Lighting products and up to 4kV in Indoor Lighting products. At the same time, Osram has external Lightning Protection products that provide protection up to 15 kV externally.