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  1. #31

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    I use a very bright red LED - probably 1 W and it will fog my ISO 3 homemade emulsions (which are not pan) if left withing 1 inch for 30 seconds. About the same for paper. I've never had any issue with fog at all, for any length of time (including the 2 or 3 hours it takes to make a liquid emulsion) at distances greater than a foot. For B&W papers and lower speed ortho films, there is very little risk of fog with Red LED's in my experience. You have to actually try to fog the paper/ortho film. I use the same light with Arista Ortho film quite often, and have suffered no ill effects.

  2. #32
    PeterB's Avatar
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    Quote Originally Posted by DaveOttawa View Post
    I've attached the SED of a flashlight that I measured
    Dave, how did you measure that ? I've had a few LESs with different centre frequencies I've had for a while, wondering what I would use to measure their response.

    Rgds Peter.

  3. #33
    Mainecoonmaniac's Avatar
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    I bought a set of red LEDs and strung them in my darkroom as safelights. It works well. I ran a test of exposing a sheet of paper for an hour with no fogging. You can also get orange LEDs too. I stopped using my Thomas Duplex safelight because the LEDs are so bright.

    Take a look:
    http://www.ebay.com/itm/Fad-Red-20M-...item3f20e362a2
    "Photography, like surfing, is an infinite process, a constantly evolving exploration of life."
    Aaron Chang

  4. #34

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    Do a proper safelight test as per Kodak's instructions prior to using LED safelights.

  5. #35
    Ken Nadvornick's Avatar
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    Or even the quick-and-dirty CD test. You might be surprised.

    Ken
    "Hate is an adolescent term used to stop discussion with people you disagree with. You can do better than that."
    —'blanksy', December 13, 2013

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