Someone else asked about getting 9V out of a 6V driver and I gathered some posts about it here: LED test / review - 36-chip 9090 LED very similar to FFL909A (9 V, 4000 K 90 CRI rosy) - over 10000 Lumen with rosy Tint! - #14 by merlot
Where did you get those high current springs by the way? They look very handy.