picard
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Can I use a blue lens filter for xenon light in order to achieve pure white light?
blue lens to filter out yellowish color of xenon bulb?
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benchmade_boy
Flashlight Enthusiast
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
LedSled
Newly Enlightened
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.
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.
benchmade_boy
Flashlight Enthusiast
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.
greg_in_canada
Flashlight Enthusiast
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/FrameWork/charts/comp_filter_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
This page (http://www.bhphotovideo.com/FrameWork/charts/comp_filter_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
picard
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greg_in_canada said:
ok thanks for the link greg. I look at it.
benchmade_boy
Flashlight Enthusiast
if you get it to work please post some pics i would love to see what the outcome is
Handlobraesing
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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.
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