E.g., a room with 4 halogen transformers/light combinations could be rewired to 1 transformer with 4 LEDs. Buy light bulbs online, or at your nearest store. Rewiring by an electrician might be an option. View our huge range of light bulbs, including incandescent, fluorescent, dimmable & filament LED bulbs.
This is a way to reuse electronic halogen transformers. Add up the Wattage (in VA or Watts) of each bulb to find out the total power.
If you are not dimming on the circuit, it is possible to wire multiple LEDs in parallel and doing so achieve the minimum load rating of an electronic transformer. However, if your LED bulbs do not work or not work reliably on the halogen transformer, you will have an electronic version rather than the old iron core. Being much more efficient, your LED bulbs individually will fall well below the transformer’s maximum power range. If there is only one number, the total power consumption of your bulbs on the transformer should be below the transformer maximum load rating and the transformer will be an iron core one. The bottom number is the minimum load required for the transformer to function, and the top number is the maximum allowable. #LED HALOGEN REPLACEMENT BULBS FULL#
If the transformer lists a range, it is an electronic one (20 and 70 in the picture). Modern full glass LED lamps look deceptively similar to original inefficient halogen lamps and are therefore ideal direct replacements. 
This information should be printed somewhere on the body of the transformer, and it may be either a fixed number or a range. Find the transformer's minimum and maximum load rating in VA or Watts.
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