Best way to light small bank of LEDs? Answered
I was trying to help someone put together a small lighted prop for a Halloween costume, and quickly realized I knew enough just to be dangerous.
The result should be simple, for someone who better knows the intricacies:
9 superbright 3V LEDs, arranged in a circular pattern about 4in dia., powered by a small pack of batteries which CAN be located elsewhere on the costume, with a small wire run.
Initially the thought was "oh, well, 2 AA's gets you the 3V, you're good..." Then we thought, "to make hooking up the LEDs simpler, attach them end to end, and then each end of the loop of LEDs goes to the two batteries."
Of course, totally wrong. After realizing the glaring problem, it occured to us that 3 9V batteries would instead get us the requried voltage to light them up.
Then, realizing again this should work but that there might be some finer points to know, I started looking up some information online for similar projects. My big fears, having not tried this out yet, are that:
1) The string of LEDs or batteries may get hot. (Seen a lot of posts like this.)
2) There is some glaring inefficiency in this setup that could be more simply redone.
For example, is it better or worse in any way to run three strings of 3? Would batteries last longer if a different configuration of batteries or wiring were used?