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   Great question and one that we get asked all the time. As a general rule the system will go 60-80m from the transformer to the last light. To achieve this it is better to go with our largest 150w transformer and the larger grade SPT2 plain cable and this all helps avoid "Volt Drop". Volt drop is where the further you go from the transformer the voltage starts to drop away. The transformer produces 12v output but this gradually decreases as you go further away. The reason that Techmar have managed to go further with their system over the few other makes on the market is all down to the clever technology in the LEDs. They are all optimsed to run at 8-9 volts and still achieve the exact same light output. Cheaper LEDs available elsewhere will only work to say 11 volts and then stop.