I think it is better to use as many in series as you can, because you waste less power in the resistors, less overall current. If you want 10 overall, and say they drop 1.5V each, you might find 5 in series with one resistor works with 9V, then have two such series in parallel to make 10.
Thanks. Hmm, that's interesting. When I put in some values into this wizard, that is exactly what it suggests doing: 2 strips in series linked in parallel to make an array of ten.
Like so:
Right, enough pontification, I've ordered some LEDs and some resisitors and I'm just gonna physically try it a few ways and see what works best!
DJ