Has anyone used GE Reveal light bulbs for indoor photography?

Discussion in '35mm Cameras' started by Viken Karaguesian, Nov 30, 2004.

  1. Hi all,

    I've been wondering about these GE "Reveal" light bulbs. Can they be used
    indoors for photography or are they not correctly color balanced? Until now,
    I've been using an 81A (blue) filter when taking indoor pictures and
    daylight balabced film.

    Anyone know what color temp the lightbulbs are?

    What happens if you use flash with these bulbs?

    Thanks in advance for any replies.

    Viken Karaguesian
    http://home.comcast.net/~vikenk
     
    Viken Karaguesian, Nov 30, 2004
    #1
    1. Advertisements

  2. I tried Reveals in a copystand. They are still considerably redder
    than daylight. I recently ordered some full spectrum fluorescent
    bulbs from Sunwave. I'll give those a try next.
     
    Michael Benveniste, Nov 30, 2004
    #2
    1. Advertisements

  3. Viken Karaguesian

    Alan Browne Guest

    On the ge websites, the bulb has a bluish tint, so some 'warmth' will be
    filtered out. They mention neodymium as an element in the glass that provides
    filtering.

    There is no meniton of the specific color temp. I've posted a question to them
    asking the color temp.

    Depends on the ratio of light between the two. A flash shot is a double
    exposure where aperture/shutter applies to the ambeint light and aperture/flash
    power applies to the flash light. Use an incident/flash meter to measure both,
    if the flash light is 2 stops more than the ambient, then the coloration from
    the ambient will probably not be perceptible (and the contribution won't be much
    either).

    Cheers,
    Alan
     
    Alan Browne, Nov 30, 2004
    #3
  4. Viken Karaguesian

    Alan Browne Guest

    From GE (by e-mail):

    "Similar to other common household bulbs, Reveal products use
    incandescent lamp technology. The quality of the Reveal light
    is achieved by adding the element Neodymium to the glass. It
    is what gives GE Reveal bulbs their distinctive powder-blue color
    when not lit. When lit, the element provides a pure, true light
    by filtering out much of the dulling yellow cast common from
    ordinary light bulbs. Reveal lamps have a color temperature
    of approximately 2850 degrees Kelvin and a CRI of 75."

    2850K sounds pretty close to a regular incandescent bulb, so you might not see
    much difference at all (or the GE lady replying doesn't know what she's talking
    about). The CRI indicates a decent ability to light things in a manner that
    'reflects' (PNI) their true color under natural light.
    http://www.google.ca/search?num=20&hl=en&lr=lang_nl&oi=defmore&q=define:color+rendering+index
    has many general defs of CRI that are not terribly coherent.

    As they say, "go buy a couple and test it" (use a neutral slide film like Sensia
    100 or EliteChrome 100).

    Cheers,
    Alan
     
    Alan Browne, Dec 1, 2004
    #4
  5. Viken Karaguesian

    RSD99 Guest

    "... Reveal lamps have a color temperature
    of approximately 2850 degrees Kelvin and a CRI of 75."

    Does **not** sound good for use with Daylight balanced color film, or
    Daylight white balance.

    (1) The color temperature is very **low** ... standard photofloods are 3200
    / 3400 degrees Kelvin ... and they require substantial filtering to match
    the daylight standard of 5500 degrees Kelvin.

    (2) A "CRI" of 75 is very low for any photographic application. You should
    be looking at something with a "CRI" in the 90%-plus range.







     
    RSD99, Dec 1, 2004
    #5
  6. Viken Karaguesian

    Alan Browne Guest

    1) Don't top post.
    2) Read the thread ... I was answering somebody else.

    A: It's hard to read
    Q: Why?
    A: No
    Q: Should I top post?



     
    Alan Browne, Dec 1, 2004
    #6
  7. Viken Karaguesian

    RSD99 Guest

    "Alan Browne" posted:
    "...
    1) Don't top post.
    2) Read the thread ... I was answering somebody else.
    ...."

    Regarding your item (1):
    Screw You.

    Regarding your item (2):
    I did "read the thread" ... and you left it incomplete.

    You provided information without any form of analysis ... I provided the
    missing information and the analysis of the light bulb's (non)suitability
    for the task at hand.

    Oh ... and if you insist on that stupid archaic "bottom posting" ... learn
    how to **trim** your posts.
     
    RSD99, Dec 3, 2004
    #7
  8. Viken Karaguesian

    Alan Browne Guest

    Sorry, I'm taken.
    That's called snipping. Reading the thread means YOU read the original posters
    message.
    If you had read the OP's post you would realize that he was totally conversant
    with the problem of using incandescent lighting.

    Cheers,
    Alan.
     
    Alan Browne, Dec 3, 2004
    #8
  9. Viken Karaguesian

    Guest Guest

    Why is it "stupid archaic"?
     
    Guest, Dec 3, 2004
    #9
  10. Viken Karaguesian

    Tom Hudson Guest

    I think it translates to 'unfashionable', as in "that's just soooo
    late-20th darling".

    Tom
     
    Tom Hudson, Dec 7, 2004
    #10
  11. Viken Karaguesian

    Alan Browne Guest

    Yeah. Going the way of courtesy and politeness...
     
    Alan Browne, Dec 7, 2004
    #11
  12. Viken Karaguesian

    Guest Guest

    Well, as the OP chose not to respond, you may be right. I'll have to use
    that phraseology, ". . .so late-20th. . ." :) Then again, Alan's response
    foots current experience both in real life and the Internet. Cheers.

    vm
     
    Guest, Dec 7, 2004
    #12
  13. Viken Karaguesian

    lqa2 Guest

    Just happened across this post and thought I would give my .02.

    Incandescent Full Spectrum lighting really leaves a lot to be
    desired... You simply cannot achieve high-qualiity sunlight emulation
    with neodymium coating. Sure they look nice and bright and cheery, but
    to accurately (scientifically) reproduce sunlight, you need to use
    fluorescent light bulbs. Fluorescents DO NOT use neodymium coating but
    actual phosphors to represent color temperature.

    The best I have seen are the Westinghouse Realite Full Spectrum light
    bulbs. You can see them online at:
    http://www.servicelighting.com/catalog_product.cfm?prod=AL04836

    They are 2,200 lumens, 6,500K (perfect Daylight) and 94 CRI.
    Sylvania's daylight bulb has 90 CRI and Philips has 84.

    Thanks.
     
    lqa2, Jan 14, 2005
    #13
  14. Viken Karaguesian

    Alan Browne Guest


    Had you googled the thread you would have seen the conclusion, that at 2850K the
    GE Reveals are far from sunlight, or rather, hardly different than other tungstens.

    Where is the spec for color temp and output? That spec says 600 lumens, by the
    way. As they are Halogen I doubt they are much different than another tungsten
    lights in color temp.
    Surely you're talking about a different lamp than the one at the link above.
     
    Alan Browne, Jan 14, 2005
    #14
  15. Viken Karaguesian

    lqa2 Guest

    lqa2, Feb 11, 2005
    #15
  16. Viken Karaguesian

    Alan Browne Guest

    Alan Browne, Feb 11, 2005
    #16
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.