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  1. K

    A 3 mirror, $70 homemade spirograph machine

    Although I later purchased a Lanling laser show, I first decided to make a spiro device. All three fan/mirrors are independently controlled using a front bay standard computer fan controller. I put in the cheapest PSU I could find. It's like a 380 watt supply but is really only suppling...
  2. K

    Cheap Laser Beam Expander/Collimator?

    I want an inexpensive beam expander/collimator, something like 10x. My 20 year old binoculars can even do 3x, so I was thinking of using a refracting telescope instead. A laser beam expander is based on an Galilean telescope so it should be fairly simple. I've tried the one from Information...
  3. K

    Sharks annoying you?  Fight back!

    Do you like to swim? Are you sick and tired of being attacked by sharks? Get the upper hand(or stump) on this cold blooded eating machine! This amazing picture... shows how YOU can fight back using science and technology. Some companies will only sell you their lowly green units! We...
  4. K

    555nm for day / ???nm for night

    I've seen posts on how the human eye shifts its sensitivity to the blue end of the color spectrum at night. While 555nm is the "holy grail" wavelength, many of us use lasers at night for better visibility. Anyone know the exact wavelength that the eye acquires best when dark adapted or have a...
  5. K

    L105G Lanling Scanner Laser Show

    So I'm very close to buying one of these. It's 50mW green only, but has lot's of patterns and is one of the less expensive scanners with DMX if I should ever use it. The slightly cheaper 40mW scanner information says 50 patterns and 200 effects while the L105G lists 100 patterns and 300 effects...
  6. K

    Looking for a quality IR filter for LPM-1 meter

    I read in a post somewhere that even a few mW's of IR can give a false reading on the meter(something about the sensor not being thermal?) and that you should place a high quality IR filter in the beam path that has a known transmittance at 532nm so wattage can be determined on some of the...