Prometheus        
Results 1 to 8 of 8

Thread: blue lens to filter out yellowish color of xenon bulb?

  1. #1

    Question blue lens to filter out yellowish color of xenon bulb?

    Can I use a blue lens filter for xenon light in order to achieve pure white light?
    Admiral of Starfleet Special Operation Forces. We are the vanguard of the Federation against hostile forces.

  2. #2
    Flashaholic* benchmade_boy's Avatar
    Join Date
    Apr 2006
    Location
    not far enough away
    Posts
    1,239

    Default Re: blue lens to filter out yellowish color of xenon bulb?

    i dont think there is a blue filter light enough to make an incandecent white. if you want a white incandecent go for a regulated surefire A2 aviatior. great light


  3. #3
    Flashaholic LedSled's Avatar
    Join Date
    Nov 2005
    Location
    Central Missouri, USA
    Posts
    125

    Default Re: blue lens to filter out yellowish color of xenon bulb?

    You can. If you want to do it scientifically, use a colorimeter to find your light's color temperature, then choose an appropriate Wratten number filter to replicate "standard sunlight." Photographers have done this for years with their lighting systems, and how-to literature is available.

    Do bear in mind that your filter will absorb energy in the red end of the spectrum, so overall brightness will suffer. It may also get hot, so be careful with plastic films.
    Illegitimi non carborundum

  4. #4
    Flashaholic* benchmade_boy's Avatar
    Join Date
    Apr 2006
    Location
    not far enough away
    Posts
    1,239

    Default Re: blue lens to filter out yellowish color of xenon bulb?

    and even if you find l lite enough filter as the more you use the incandecent unless it is an a2 aviator then the light will get more and more yellow since its not regulated.


  5. #5
    Flashaholic*
    Join Date
    Jun 2004
    Location
    Saskatoon SK Canada
    Posts
    1,146

    Default Re: blue lens to filter out yellowish color of xenon bulb?

    There are filters for (film) cameras to allow you to shoot under tungsten light with daylight balanced film. They are a pretty dark blue so you are throwing away a lot of your light to convert ~3200K incandescent light to 5500K daylight.

    This page (http://www.bhphotovideo.com/FrameWor...r_factors.html) shows the filter factors for various conversion filters. The 80A is 2 stops (= 4x the exposure time = only 1/4 of the light coming through). If you used an 80C it would only be 1 stop (so half the light would be blocked and the other half comes through).

    Greg
    My EDC: Chrome Draco.

  6. #6

    Default Re: blue lens to filter out yellowish color of xenon bulb?

    Quote Originally Posted by greg_in_canada
    There are filters for (film) cameras to allow you to shoot under tungsten light with daylight balanced film. They are a pretty dark blue so you are throwing away a lot of your light to convert ~3200K incandescent light to 5500K daylight.

    This page (http://www.bhphotovideo.com/FrameWor...r_factors.html) shows the filter factors for various conversion filters. The 80A is 2 stops (= 4x the exposure time = only 1/4 of the light coming through). If you used an 80C it would only be 1 stop (so half the light would be blocked and the other half comes through).

    Greg

    ok thanks for the link greg. I look at it.
    Admiral of Starfleet Special Operation Forces. We are the vanguard of the Federation against hostile forces.

  7. #7
    Flashaholic* benchmade_boy's Avatar
    Join Date
    Apr 2006
    Location
    not far enough away
    Posts
    1,239

    Default Re: blue lens to filter out yellowish color of xenon bulb?

    if you get it to work please post some pics i would love to see what the outcome is


  8. #8

    Default Re: blue lens to filter out yellowish color of xenon bulb?

    The Coleman headlamp sold at GI Joes has a blue-film coated xenon lamp to make the beam appear whiter. The super white PIAA bulbs used by "import tuners" work on the same principle.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •