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  1. SongDog

    Lightbulb burnout

    Sounds like a bog-standard grossly inefficient "warm white" 2700K 300W at 120V incandescent like Philips 38941-1 listed on page 138 of It appears the "300W" is closer to 282W (perhaps...
  2. SongDog

    Laser interaction with ions

    Continue on straight? In a fibre? They normally are made with a radially graduated index of refraction to self-focus along the central axis, aren't they?