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Extend Battery Life when powering a LED bulb.? Answered

Trying to extend the Battery Run time when powering a 12 diode LED.

3AA Batteries 3.6V 1000maH LED 3V 146mA 5W

Test: Battery Fully charged 4.06V LED No Resistor 379.4 mA 140 LUX
4.7R resistor 164.9mA 36 LUX acceptable light output.
2 hrs later 3 LUX output.

How do I build a circuit to oscillate the Current to extend battery life to 5 hrs with a 36 LUX or higher output.
Your help would be very much appreciated. if you contact myself at legacy.construction@gmail.com
I can explain what I am trying to achieve.