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Thread: Building a Light Panel

  1. #11

    Join Date
    May 2006
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    grand rapids
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    Re: Building a Light Panel

    Lite ribbon by LiteGear has what you need. Yes, it costs more but their stuff has a cri of 95 and is pretty damn bright. I've been using it for several years at work.

  2. #12

    Join Date
    Mar 2008
    Location
    Philadelphia-ish
    Posts
    112

    Re: Building a Light Panel

    Quote Originally Posted by Peter De Smidt View Post
    Unfortunately, CRI isn't all that good of a light quality measure. See: http://leapfroglighting.com/attentio...nger-relevant/

    While I agree 100% that there are superior metrics to CRI, if the OP limits their LED tape search to brands they can find CQS or RA2012 data for, their options will be pretty limited.

    If on the other hand you accept that above 90 cri will be "pretty good" 80-90 will be eh and below 80 not so good you at least have a starting point.

    If you're needs are more specific, CRI won't get you there, but in the absence of better information, its at least worth considering as an indicator.

  3. #13

    Join Date
    Sep 2004
    Location
    Chicagoland
    Posts
    470

    Re: Building a Light Panel

    Quote Originally Posted by vinny View Post
    Lite ribbon by LiteGear has what you need. Yes, it costs more but their stuff has a cri of 95 and is pretty damn bright. I've been using it for several years at work.
    Thanks vinny.

  4. #14

    Re: Building a Light Panel

    Interesting read and LED database for those considering a similar project:

    http://indiecinemaacademy.com/comple...i-cqs-tm30-15/

    They consider several other factors than CRI as well.
    They also mention that their database is in the process of being updated with even newer products.

  5. #15

    Re: Building a Light Panel

    I have one of these and 6 six-foot versions in my garage for... garage light. Don’t know if this would work for you but they are cheap, run cool, and provide LOTS of light.

    https://www.samsclub.com/sams/linkab...-also-viewed:3
    --- Steve from Missouri ---

  6. #16

    Join Date
    Sep 2004
    Location
    Chicagoland
    Posts
    470

    Re: Building a Light Panel

    I finished my two panels measuring 5.5" x 11.75". I can attach them together to make an almost square panel or I can mount them one above the other or use them separately. I found some 60º grids that are the right size and I also made a couple of snoots out of mat board. Everything works well.

    I made some comparison exposures. Using these and then with a 500W Tungsten source. Exposures were the same, developed them together and I just made some prints. The subjects were book ends and album cover ends with plenty of various colors. I just took the prints out of the wash and the differences are so slight it's not a concern. The reds rendered slightly darker. This test was done using Ilford Fp4+ developed in tubes using Pyrocat HD 2:2:100.

    Had I not already bought the Flexfire LED's I would have considered the ones Vinny mentioned because in color there is a difference, the yellows tend to render a bit green but since I made these for B&W work I'm quite happy with the results. I found a battery pack that can run both lights at the same time. I'll be testing them with a model who I've photographed before using strobes.

    I hope this is useful to the community.
    Attached Thumbnails Attached Thumbnails lightpanel.JPG  
    Last edited by chris_4622; 7-Jan-2018 at 10:00.

  7. #17

    Re: Building a Light Panel

    Thanks for suggestions!

  8. #18

    Join Date
    Mar 2017
    Location
    Del City, OK
    Posts
    198

    Re: Building a Light Panel

    If you're worried about CRI, then you could build a box with red, green, and blue LED's, put each color on it's own circuit with an inline potentiometer, and then you can vary the color mix as you see fit. Then just take something that you want to call white, shine the light on it, and adjust until the object looks white to you. That would also allow you to match the colors of other light sources, such as overhead lighting, daylight, or flashes. And it could act like a variable color filter for your lens for B&W work.

  9. #19

    Join Date
    Sep 1998
    Location
    GA
    Posts
    11,375

    Re: Building a Light Panel

    Quote Originally Posted by jim10219 View Post
    If you're worried about CRI, then you could build a box with red, green, and blue LED's, put each color on it's own circuit with an inline potentiometer, and then you can vary the color mix as you see fit. Then just take something that you want to call white, shine the light on it, and adjust until the object looks white to you. That would also allow you to match the colors of other light sources, such as overhead lighting, daylight, or flashes. And it could act like a variable color filter for your lens for B&W work.
    Or find the old Kodak test patch that showed if your CRI is photo quality visually!

  10. #20
    Resident Heretic Bruce Watson's Avatar
    Join Date
    Sep 2003
    Location
    USA, North Carolina
    Posts
    3,217

    Re: Building a Light Panel

    Yuji has an excellent rep. in indy video circles. They have a decent selection of DIY stuff too. If it'll work for video, it'll work for anything we do here.

    Bruce Watson

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