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  1. C

    405nm looks blue on white cotten

    Does anyone know why this happens? I've taken a wave physics course and I can't seem to figure it out o.o It only happens on white cloth. Not dark cloth. Not white doors.
  2. C

    445nm test loads

    I have 1n4004 diode's laying around the house which have a foward voltage drop (Vf) of 1.6V Since 445nm Vf is 4.0-4.5V, I could use 3 of these. for 4.8V The question I have: 1N4001's have a different Vf. How much of a difference? What effect will a LARGER Vf have on the mV reading...
  3. C

    Is it normal to see color?

    For my first laser, I bought a pair of cheapies for 5$ for 532nm. Works perfectly, while bleaching the color right out of the dot. I'm building a 1W 445nm (probably will set it < 500mw) and I'm iffy about the glasses I just bought. I have a 4$ purple laser pen I bought on ebay with my ebay...


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