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FAQs zu Netzteile, Konverter, Treiber (CC) oder Trafo (CV)
Dieser FAQ-Abschnitt behandelt Fragen rund um Unterschiede und Anwendungsbereiche von verschiedenen Netzteil-Ausführungen wie LED-Treiber oder -Trafo anhand der Merkmale wie Konstantstrom/-Spannung mit Einheiten Volt bzw. Ampere/Milli-Ampere.

Power supply buying guide - Find the right and best power supply for your LED system

In the following table we explain what is important and what the main differences are. Basically all LED DC power supplies must comply with DIN61347. Only then they are allowed to be used with LEDs. A feature we pay attention to.

Overview of relevant performance characteristics of LED power supplies
Power supply typesLED transformer
Constant voltage power supply*)
LED driver
Constant current power supply
Main feature:
Voltage (Volt)
impressed/fixed, constant.
Example values: 12Volt, 24V, 48V
depending on the connected LED module, LED spot, LED string.
Specifications correspond to a "working range",
determined by the number of LEDs. (independent of the current).
Example values: 350mA/700mA .... 1050mA
Main feature: Current (amps, milliamps)depending on the number and power of the connected e.g. LED strips.
(can be set to a max. value with some power supplies).
set current is fixed.
Drives (!) a defined current through the LED string.
Power (Watt)16W to 600W 1,4W to 100W
Areas of application:Low voltage LED modules, LED boards with integrated electronics for the LEDs.
Main application: LED strips, LED strips, as well as their control electronics.
Pure COB LED chips, LED ceiling recessed spotlights, LED boards in luminaires for direct constant current operation. It is mandatory to pay attention to the current specification.
Flicker/DimmingOutput brightness control via PWM (pulse width control). Flicker depending on modulation method and frequency.Mostly PWM control, is increasingly replaced by versch. innovative solutions such as hybrid dimming or completely flicker-free linear control (AM, - amplitude modulation). (Look for the "AM" symbol).
LichtsteuerungLichtsteuerungLight controlFor both types brightness control via common technologies such as phase dimming, DALI, 0/1-10V, touch dimming, or control via radio (Casambi, Bluetooth, Enocean, Zigbee) is possible.
(Use our filter function to quickly narrow down)
HousingAvailable housing forms are sheet metal, aluminum and plastic housings, fully encapsulated with high IP protection, as a device with strain relief (for e.g. operation as an external power supply in false ceilings) or as a recessed version for integration into an LED luminaire system.
Versions in plug form, top-hat rail or box installation are also available.
CoolingAll our devices in the store are quiet power supplies and work with passive cooling. During operation, we recommend compliance with the test point Tc specified maximum temperature. This ensures a long service life.
Power supply manufacturer in store
(only renowned Brands)
Meanwell, Pur-LED, Arditi, Lunatone, TCI, Eldoled, Enertex, Code Mercenaries, Tridonic
alternative namesLED power supply, LED transformer, DC power supply, mains transformer, transformer power supply, fixed voltage power supply, electronic transformer, constant voltage sourceConstant current source, constant current Driver,

*) Attention: These are direct current (DC) power supplies and differ in application from alternating current transformers as with specifications of 12V AC.
It is imperative to pay attention to the exact specification on the lamp.

For closer containment, we have set up filter functions on our pages for closer containment and is highly recommended by us. You are also welcome to send us a mail for further help.

In the past, there were lamps for operation on 230V (HV) or also for e.g. 12V low voltage. The lamps were designed accordingly and could be easily replaced. 
To operate 12V lamps, for example, a power supply unit, or transformer for short, was required to transform the 230V voltage to 12V.
With the advent of LED technology, many new operating modes became established.
Replacement LED lamps in particular (e.g. with GU5.3 base) still require a transformer. So-called LED transformers were developed due to the now lower output and a previously high minimum load. While other LED concepts are replacing the LED lamps for replacement and producing special LED drivers for direct operation of the LEDs.

LED transformers are specially designed for constant voltage operation of LED systems and supply a fixed voltage at the output, e.g. 12V or 24V.
A distinction is also made here between 12VAC (for e.g. 12V LED lamps, usually referred to as retrofit lamps) or 12V DC or 24V DC for operating mostly LED strips/LED tapes. 
The voltage is constant (CV=constant voltage) and the current (mA) depends on the power of the connected lamps. 
LED drivers, on the other hand, provide a constant current (e.g. 350mA). The reason for this is the special (U/I) characteristic curve of a diode, especially a light-emitting diode (LED). If operated with a constant voltage, the current would change considerably, even to the point of destruction, in the event of the slightest instability in the voltage or even ageing or temperature changes. For this reason, the current is limited or kept constant. An LED driver drives a constant current through the LED(or several LEDs connected in series). The voltage that then "drops" at the LED ("forward voltage") or the sum of these is then the voltage measured at the output of a driver. The power supply unit must be able to provide this. This is why voltage ranges are often specified here. The current is constant (CC=constant current) and the voltage depends on the characteristics of the LED system (number of LEDs).

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