Joule Thief: JTBasic + 70nF Energy Run 1
I found that adding a 70 nF cap across the base resistor makes for a very interesting wave form, a slight decrease in light output, and a drastically increased run time. To figure out the energy into the system and the average power dissipation, I put a known voltage on the known capacitor and time how long it takes to drop a specified amount of voltage. Since the Energy on a cap in Joules is (C * V * V) / 2, it is easy to calculate the starting and ending energies, and divide that by the time spent, to get the average power input over that time period. But the energy itself is the conserved quantity and this is what will be compared to the output energy, eventually. This is the same JTBasic circuit, with the series-parallel bank of 24 white LEDs from a Harbor Freight flashlight special, running on the 3F cap, charged to 1.5 volts and run down to 0.750 volts, with a timer.