you should get 3.0v across the led, the ones I used did not like much more than 3.5V, poof if you went much higher.....
http://www.radioshack.com/product/index ... PerPage=60
if you used the white tube bases you will have to source 3mm dia leds, also you will have to take out the center connector, use a small drill bit to remove the swedged out part, then you can push the rest of the barrel out.....
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