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You better consider using FETs for these high voltage switching purposes. Or else you can use Darlintons such as TIP series.

So many people are asking this question, so I thought to create a topic to discuss about this. Here are the diagrams for both options.

NOTE: D4 and D2 LED symbol represent a LED set (series/parallel) which requires 12V.

1. Transistor 2. FET

Hi Gihan, Your digram explains the issue very well. Basically it is not correct. Consider following options. Logic Level FET one is my favourite. NOTE: D4 and D2 LED symbol represent a LED set (series/parallel) which requires 12V. 1. Transistor switching Transistor.JPG 2. FET Switching FET.JPG I use...

Hi Gihan, First I need to understand more about how you have connected the LEDs. Can you post a drawing please. You need to mention input voltage for LEDs as well. I might suggest you to move to a darlington or better to a FET, but before all that, I need the circuit diagram to understand.

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