Gata
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Problem solved. I feel as dumb as I did after watching kipkay's video.
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For .8A you will need 1.6Ohm with a rating of 1W or more.
Resistor rating is how much the resistor can dissipate itself, if too much power is passing thru it, it will ovearheat, and eventually burn, just like laser diodes.
Thats right.I thought it was [Voltage drop across the resistor X Current = W] in the case of LM317 the regulator will always maintain a 1.25 voltage drop across the resistor so that is 1.25 x .08 = 1 Watt.
Just upgraded the resistor on my 445nm driver to a 1 watt 0.5 ohm resistor.
Anyone tell me the max output, because thats what it is running at now:eg:
Just tested it on the Mrs (she didnt know LOL) and at 15metres she thought a wasp had stung her...after about 3 seconds Double LOL!