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Very nice solution! But don't you have in this way constant usage of power by resistor? Let me be more precise. I want to build simple solution to limit current that my bike lamp use from battery but I want to have max efficiency so the lamp work as max as it can if you understand me. So, if I use resistor like you draw above, am I going to have constant power(in this case capacity from battery) waste by resistor? thank you for your help.