plz mention the duty cycle, how long it would be on before turning off for 10sec?
I hope it is DC voltage you supplying.An RC network feeding to the combined two pins of a NAND gate will work.
Here is a circuit that take no power once the LED is extinguished:
This LED illuminates for a few seconds when the power is turned on. The circuit relies on the 47u discharging into the rest of the circuit so that it is uncharged when the circuit is turned on again.
It seems to me it's a perfect power saving circuit. With a base resistor of 47K (at 3 to 5V Vs) the transistor will never turn on.