I've got a hyperboost driver that I'm trying to drive 5 cree xm-l's with. I've got them wired in series. I want to power it with a small 12 volt battery. Now from what I see, the xm-l's need an input voltage of 3.3v each. So the driver needs to put out 16.5 volt. From what my multimeter is telling me, there's about 90 volt of output. I'm sure I've fried the led's. What am I going wrong here?