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  1. #1
    Willie Jan's Avatar
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    Using red led strips in the darkroom

    Is someone using led strips in the darkroom?

    I saw somewhere that they were using a led strip, but wondered if this is possible without fogging paper.
    The red leds offered at ebay should be between 600-720 nanometer.

  2. #2
    David Brown's Avatar
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    See: http://www.apug.org/forums/forum43/1...9-99-safe.html

    And a search will bring up even more discussion of led safelights.

    Will they work? Maybe. Any safelight must be properly tested.

    http://www.kodak.com/global/en/consu...Safelite.shtml
    David
    Taking pictures is easy. Making photographs is hard.

    http://www.behance.net/silverdarkroom
    http://silverdarkroom.wordpress.com

  3. #3

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    I bought a 3 color LED light strip to try out and experiment with. I don't care for the character of the "white" light it provides, but using it with just the red LEDs for safe lighting is working out very well. (I was hoping for lighting that could be white and safe in one).

    I tested it up to 15 minutes with no fogging, it's very bright, and the remote allows you to dim it in any color.

    The product I bought is this one, or similar to it;
    http://www.homedepot.com/p/Commercia...vZc7phZ1z115g2

  4. #4

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    I'm using a long strip of red LEDs in mine. They point up and bounce off the ceiling for soft, even illumination. I added a LED dimmer so I could adjust the brightness as well. These red LEDs tested safe out to twenty minutes (I went out to thirty minutes) using the Kodak safelight testing methodology.
    Attached Thumbnails Attached Thumbnails Dark-2.jpg  

  5. #5

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    I tie my safelights into the enlarger timer, so I would always worry that a mixed colour strip would not come back on as red 8-)
    I feel, therefore I photograph.

  6. #6
    Willie Jan's Avatar
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    Thanks guys.

  7. #7

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    I cut a 20cm strip and make a crefully test it with some piece of papers, distance from 3m to 30cm, in 45 minutes. After develop and fix, they're still white, so it's absolutely safe! Not only cheap, easy to find, but also much brighter than traditional safelight.

  8. #8

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    Why suffer with red when you can use amber and yellow. I use one string of each streched out the length of the darkroom. Easier to see and no paper fogging at all. Tested for 10 minutes with no fog. It makes it easy when I'm cutting roll paper down to 8x10 sheets.
    Gun Control is like: Reducing drunk driving by making it harder for SOBER people to buy cars.

  9. #9
    David Brown's Avatar
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    Quote Originally Posted by Cruzingoose View Post
    Why suffer with red when you can use amber and yellow.
    Well, "any" color will work if it tests "safe".


    Quote Originally Posted by Cruzingoose View Post
    Easier to see ...
    For some. Some prefer red. YMMV

    I used to have red lights that were not safe in the darkroom for when I needed more light, but didn't want to use the white lights, so that I could retain my "night vision". I learned this from the astronomy folks. (Now with much brighter safelights, I don't do this anymore.)
    Last edited by David Brown; 02-24-2014 at 02:54 PM. Click to view previous post history.
    David
    Taking pictures is easy. Making photographs is hard.

    http://www.behance.net/silverdarkroom
    http://silverdarkroom.wordpress.com

  10. #10

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    LED Lites

    Any color won't work. Blue and green will most definately expose your paper. Yellow LEDs work better than Low pressure SOX lamp used in the the famous Thomas safe light, known for incredible brightness due to the narrow bandwidth of sodium. But it still required a filter to remove the neon and mercury lines. The LED has a much narrower bandwidth and needs no such filter as its light is very pure. Yellow is also less irratating to the eye as your eye is most sensitive to green. Red is at the end of the range of human vision and thus requires much higher illumination levels to appear the same brightness as yellow. Amber has been the safelight standard for many years and LEDs produce this color very well. It is the second color LEDs were available in the early days. The first was Infrared, then red, amber, yellow, yellow green, then pure green in the mid 90s, followed by blue. There are two violet LEDs out now. One is a blue LED using a red phosphor and a native violet and recently true UV LEDs. White LEDs don't count as they are all blue LEDs with a drop of yellow and/or white phosphor over the die.

    The problem with LEDs, or rather the marketing (profits), is the LED can last forever. Because they are extreemely overdriven they are marketed as having a 20,000 to 50,000 hour life. Heat and overcurrent can destroy and severly shorten the LED lifespan significantly.
    Gun Control is like: Reducing drunk driving by making it harder for SOBER people to buy cars.

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