Now I'm getting more confused. I was using a 330 resistor to power the LEDs and it stopped after 2. 1 was fine, 2 was really dim, and 3 was nothing.
I heard 4 AA batteries how more milliamps, so they would be better to power LEDs. Using some equation thing I found, I would need 20 volts for my LEDs. That's where I came up with the 2 9v batteries (I'm still 2 volts low, though).
I was talking to some other people who really don't know, either, but they said that LEDs require very low power and it shouldn't be hard to get them to at least be able to stay on for 24 hours, if not a week. Is this completely not ture? I would like to get 4 hours out of them.
So I should just stick to the 9v I got, but wire the LEDs in 5 pairs instead of all in series?