It all depends on what you've got. All LED bulbs require a 'driver' (a special type of transformer) to work properly. The transformer will draw some current when the bulb circuit is not complete though not a huge amount, If you are asking is it green, no it's not. What do I need to consider when upgrading to energy saving LED downlights? The purpose of the transformer is to reduce the mains voltage (240V) to the desired level relative to the bulb being powered (e.g. If you are replacing existing incandescent 12V bulbs you will need to replace the transformer with a special LED driver. The maximum wattage rating, as you probably guessed, indicates the largest total number of watts a transformer can handle. If you have low voltage halogen bulbs installed with a transformer, the first thing you need to do before replacing Halogen MR16s with LEDs is to find the transformer’s maximum load. The customer used to use halogen but has moved over to LED. If it is a Fading led bulb, there would be more circuitry inside for that. That's fine. These 12VAC transformers are already in place in the majority of houses and businesses as incandescent bulbs could take AC power and it had advantages over going straight from the main line (120VAC). You take the amount of LED tape you have in metres and x this by the wattage of the LED tape you have, again per metre. This is why when retrofitting to LED Corn Light Bulbs you need to direct wire the socket. AC LED drivers are typically used with bulbs that already contain an internal driver MR16 and other 12V bulbs use an external driver. You'd need to measure the current draw of the transformer to know just how "not green" it is. While LED drivers are a type of power supply, certain types of LED lighting systems may require an LED transformer, and you need to know why. I'm 100% LED now - even my fridge light is LED. They had stopped working due to a faulty 12v transformer I've just replaced the transformer with a constant voltage driver (1 … Once your landscape lighting design is complete, you can figure out what size of low-voltage transformer you need. LEDs don’t need a ballast because of a number of reasons. FAQ - Magnetic vs. Electronic Transformers for MR16 LEDs. However, if you install a light fixture with three 60-watt light bulbs, you'll need a transformer with a maximum wattage load of at least 180 watts. When switching to LEDs this can be a problem as LEDs need direct current, and most LED drivers are made for low DC voltage or high AC line voltage. Giacomo, If there are any other lamps that are working which were connected to the transformer then the transformer … Then you must check to make sure your LED bulbs use the same voltage. Though typically a little more expensive than a standard transformer, they ensure that LED light bulbs … Let's say you have one light fixture with one 60-watt light bulb for the transformer mentioned above. They had stopped working due to a faulty 12v transformer I've just replaced the transformer with a constant voltage driver … The transformer's minimum wattage rating tells you the smallest number of watts it needs to power in order to work. Then they step it down, then use a current control section to provide the final step for the lighting. Now LED bulbs that are meant to be replacements for standard 120v incandescent bulbs are very similar to CCFL bulbs. Now that 12V LED spotlights are becoming more common, a wide selection of dedicated LED enabled transformers are coming onto the market. They have AC rectifying section, most are half wave. It has taken me a couple of years of learning to get it right. An LED transformer is a type of power supply for LED lighting systems. AC LED drivers are typically used with bulbs that already contain an internal driver The number of lights that will be installed will determine the size of the transformer, and the size of the low voltage electrical wiring.