• In order to power a 12 volt lighting system from the mains (240v), a 12v transformer is required to convert 240v down to 12 volts.
• The 12v current then distributes to the 12v light fittings which ‘T-Junction’ off at desired points from one main 12v cable run.

1.Add up the total wattage of your 12v lights per run: e.g 3 x 5W Spikelights = 15W Total 

2. Purchase the relevant transformer based on the total wattage. Make sure you won’t be overloading or ‘maxing out’ the transformer*. It’s as Easy as that!

• 10w Transformer recommended wattage = 4w to 8w Max.
• 20w Transformer recommended wattage = 10w to 18w Max.
• 50w Transformer recommended wattage = 20w to 45w Max.
• 100w Transformer recommended wattage = 50w to 90w Max
• Lumena 12v transformers with a 240v 3-pin plug can either be plugged into a 240v socket, usually outdoor, or the plug can be removed for hardwiring to a mains terminal
• If you’re plugging the transformer into a socket, then ALL 12v wiring or 12v plug and play connections can safely be carried out by anybody!
• If the 240v side of the transformer is being hard-wired into the mains, this needs to be carried out by an electrician.

*It is equally important that Transformers are not greatly underloaded or the output voltage will rise. Lamps could burn out in a shorter time. This is usually a problem if the lamps are not LED. Ideally but not essentially, transformer load should be approx. 70% of it’s capacity.

As well as our wide range of low voltage outdoor lights, we offer 12v accessories such as 12v cable reels, 12v extension cables, 12v led lamps and 12v transformers in different wattages.

For further advice or information, please contact our sales team on 01327 871161.