So,,I am trying to wire up two 5mm UV LEDS to backlight my vasaline marble monster eyes. I have done LED's before with no issue but for some reason these little devils appear more tempermental. I think the heat is getting to them during soldering since they work just fine temporarily wired with a 330Ohm resistor in place. I usually use half a dozen pennies clamped around the stem of the LED as a heat sink and try to be quick about heating the connection but its no use...they are done for by the time I get a decent bead. Anyone have any ideas where I am going wrong? These are 380um UV LEDs 3.5-4.5 VDC wired in series and I am running them off a 9v battery with a 330ohm resistor (until I install them that is).