DIY light source for 10X10" enlarger.

Discussion in 'Darkroom Developing and Printing' started by jjs, Apr 9, 2008.

  1. I don't see why not.

    Fluorescent bulbs and their ballasts are not optimized for graphic
    arts applications. It doesn't matter what you use, though a
    high-efficiency instant start ballast is probably the best choice.
    There is some anecdotal evidence that electronic ballasts cause
    premature blackening of lamps designed for magnetic ballasts.

    With standard fluorescents you may have to keep the lamps on
    and use a shutter on the enlarger lens to get really consistent printing
    results. A compensating timer won't do a complete job of mitigating
    lamp warm-up.
     
    Nicholas O. Lindan, Apr 14, 2008
    #61
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  2. "David Nebenzahl":
    277 also. 120, 208, 220, 240, 254, 277, 347, 380, 415, 440, 480 and
    600 are the common voltages.

    415 for lighting is pretty rare, but I worked in a building
    that was wired for it. The building super would swear at
    length about it if anyone would listen.

    The odd voltages are from 3-phase systems and are phase-phase and
    phase-ground voltages: 120/208, 220/380, 240/415, 277/480,
    347/600. 120/240 normally being a 2-phase pair.

    The voltages relate either by 2 or the square root of 3 (1.73).
     
    Nicholas O. Lindan, Apr 15, 2008
    #62
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