and
I'm wondering what's with that 1watt resistor? it appears to be on all these modules (except, some are 10mw/20mw etc) the only difference is the resistor value, this circuit can't possibly be just a regulated voltage and a resistor to keep a constant current vs that of a regulated current.....
(Lower Resistor = Brighter? gut feelings?)
I found a nice little UV/Purple Diode on Ebay.... I just bought a 100mw I got to hold out for the UV project