I bought a KL1 mod'd by Chop with 700mAh output and a fraen LP optic. Works on 3-9 volts. It's a great light and is my current EDC. I believe both Chop and CM does these mods, you should contact one of them or check the Modder's B/S/T. Good luck!
I can mod your existing KL1 or I can get you a brand new KL1 that's been modified to whatever current bias you want. Send me a PM if you're interested. Chop does this as well.