I have recently started adding lighting to my clocks with fiber optics and LEDs to light them. The backs of the clocks have limited space, so I am powering from 2 AAA batteries. (A 1" X 1" proto board will fit). Works OK on LEDs with smaller forward voltages (1.7-2.8) with 47Ω 1/2W resistor, but need to get higher voltages for the blue and white which are over 3.0V. Also, need help with getting more life out of batteries, lights getting dim after a few days, and out after 2 weeks. Would 1/4W reistor help? Tried an LDR, but they pull 15mA when in light and the LEDs pull 20mA, so using almost as much battery when LED is off. I am a beginner with electronics, please keep it simple. Appreciate any help.