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FAQ - Magnetic vs. Electronic Transformers for MR16 LEDs This article assumes you are considering retrofitting existing low voltage halogen downlights with LED lights (MR16 lights are also known as GU5.3 sometimes). LED MR16 lamps require external driver circuitry in order to step down from the 120/240VAC mains supply to 12VAC. The LED chips inside LED lamps are driven by direct current (DC). As a result of this, MR16 LED lamps contain electronics to convert from AC to DC (generally a bridge rectifier). There is also a different class of low voltage LED lights that do not contain a a bridge rectifier and are DC only (12V to 48V DC in general).

These lights are not suitable for retrofitting to existing low voltage halogen tranformers and are not considered in this article. Generally these lights do not have a MR16 fitting and are instead sold with a compatible hard wired transformer (a LED driver). This article looks at if existing wire wound transformers should be kept when switching to MR16 LED lighting or if a full or partial replacement with electronic transformers should be done. The compatibility differences between electronic transformers is examined in another FAQ article. Electronic Transformers Electronic transformers for halogen lighting, including the OSRAM Redback transformer used in our test setup, often require a minimum load of 20-60W or 10-60W throughout the line-voltage cycle otherwise the transformer will turn off and the lamp light can flicker. Due to the low power consumption characteristic of LEDs, a single LED light cannot meet this minimum load, needing additional 'intelligent' circuitry to draw an input current compatible with the electronic transformer's load requirements. Therefore, unless the LED lamp is specifically designed for backwards compatibility with halogen transformers, it may exhibit issues such as flicker, buzzing or poor light output.
The best solution is to test with a single fitting for compatibility before bulk replacement. An alternative solution for the insufficient loading problem is to connect several LED bulbs in parallel to the same transformer or include a halogen bulb in the circuit.
While this may solve flickering and buzzing issues, it should be kept in mind that these transformers often have a specified maximum length allowed in cables connected to the transformer's secondary in order to limit voltage drop. Lamps installed in the same transformer must also have cables of the same length to avoid variation in their light output. Wire wound Transformers When used with LED lamps that are 12V AC/DC compatible, wirewound (also called 'iron core', 'electromagnetic' or 'magnetic') transformers exhibit little to no issues regarding dimming, flicker and buzzing. As their construction is simpler they should also be more durable. They are, however, very inefficient in terms of power consumption compared to electronic transformers. They are also harder to buy new as they are being replaced by electronic transformers. If purchasing a new magnetic transformer then consider a toroidal magnetic transformer as they are considerably lighter, quieter, and more energy efficient than the traditional brick style.
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Power consumption using different transformers, when powered Wattage and power factor were measured for different LED lamps when connected to a ATCO TM50-2 wire wound transformer and a. The results are provided in the table below. Testing across 13 LED lamps from different manufacturers, the lamps drew an average of 4.5W more when supplied by the iron core transformer.