As continuation of our project, we built the tube and connected to a circuit with 4x more capacitance. We were able to light up 6 LEDs easily. =)

Starting voltage: 0 V
Ending voltage:  8.5 V
Capacitance: 4 x  4700 microFarad
Starting energy: 0 joules
Ending energy: 0.5 * 4 * (0.0047 F) * (8.5 V) * (8.5 V) = 0.68 joules
Time: 20 secs
Power: 0.030 Watts (it is the same power we got in the previous alternative – YAY!)

Last, but not least, we transformed our circuit into a wearable (work still in progress)