Re: Night lights

[Clive Warren <Clive.Warren@xxxxxxxxxxxxx>]

>
>> >The Casino lights are mostly flourescent and give out almpst no IR light.
>> My mistake -  neon lights do of course give out IR and it seems that many
>> of the Casino lights are neon rather than flourescent.
>
>Sorry if this has been pointed out before but am just getting into the fray
>here. It seems to me that the effect is the same. Neon lights are fluorescent
>lights except that they are made up of a mixture of gases that is different
>from what we normally call fluorescents.
>
>As for IR output this depends on spectral energy distribution of the glowing
>gases. If you are photographing with a #25 filter you will, of course, be
>greatly influenced by the red neon lamps but the blues and greens will have
>little effect. Another factor to consider is whether one is using any
>filter at
>all. If using a filter then the level of exposure also plays a great part in
>the ultimate results. You will get the "glowing feeling" through simple
>overexposure.
>
>... methinks.
>
>Andrew  o o  0 0 o . o  Davidhazy, Imaging and Photo Tech
>         \/\/\/\/\/\/          http://www.rit.edu/~andpph
>__________|        |_____________________________________


Andrew,

Thank you for the clarification.

Thought about use of terms whilst typing the last message and used the term
fluorescent to refer to the white type of common or garden office lighting.
In the same way that a Hoover is thought of as a generic suction cleaning
device, and some people still use the term transistor to refer to a
portable RF receiver.

So, will be more rigorous in using terms - it's good to avoid confusion :-)

It was only a couple of weeks ago that I was using colorimeters to look at
the visible spectrum from neon and argon lamps :-)


Looking forward to seeing these Casino light photos......


All the best,

             Clive   http://www.cocam.co.uk
                     Photographic Services, Filters and Equipment
                            http://clive.bel-epa.com
                            Adventures in Cyberspace - Digital Art and Photos


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