Photography Tip-The Benefits of Lighting with a Bare Flash Tube
Digital photography has advanced beyond film photography in many ways, but they both need light to register an image on the digital sensor or a frame of film.
The Flash Tube:
Next let's take a look at the flash tube. Photoflex® uses a German manufactured flash tube built for long life and color accuracy.
Flash tubes can fail too, but they very rarely do. They can also break. In case they need to be replaced it's a good idea to get flash heads that have user-changeable flash tubes (see picture right).
The flash tube is then fired at the previously determined power level to illuminate the scene. Start time of the flash burst depends on whether first or second curtain sync has been set.
The Norman flash tube plugs into a standard 4-pin vacuum tube socket, which is exactly the right size at its base diameter to make a snug fit in the screw base socket.
Another camera flash tube design: In this curved tube, the trigger plate is attached directly to the glass on the tube.
Ring flashes, with flash tubes arranged in a circle around the front of the lens, can be helpful in lighting at close distances. Ring lights have emerged, using white LEDs to provide a continuous light source for macrophotography.
If you look closely you will see that the Athena ring-flash is actually a Sea & Sea YS-01 flash system with the flash tubes removed. Athena modifies the YS-01 so that their proprietary flash tube connects to the innards of the YS-01.
Since the flash heads contain little more than a flash tube, modeling light, and a reflector, they are pretty light, weight-wise, and don't require as sturdy a stand as monolights.
Profoto D1 500 Watt Second Air Monolight Flash with Built-in Reflector & Power Cable, Coated Flash Tube
Flashpoint II 1220A Monolight, 600 Watt Second Strobe ...
Normally consisting of simply a flash tube and pilot lamp that shines continuously to enable the user to check the exposure, they have no automatic metering system and must be adjusted manually.
To do that, the flash changes the distance between the actual flash tube (the light) and the diffuser (the plastic front of the flash).
A gas in photographic flash tubes.
XD picture Card
Fuji and Olympus proprietary storage media. The name xDPicture Card was derived from eXtreme Digital and with a capacity for up to 8Gb of data.
Gels
Coloured filters that can either be held over a flash tube or used in a mount in front of the camera lens to change the colour of the light.
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More Photographic Terms ...
Is a gas sometimes used in electronic flash tubes and enclosed arc light sources.
XGA:
An image resolution of 1024 x 768 pixels.
This happens when the flash tube and the lens are in close proximity to each other.
Modeling Light: A relatively weak incandescent light bulb mounted in an electronic flash head next to the flash tube.
-Xenon is a rare gas sometimes used with electronic flash tubes and enclosed arc light sources.
Four of them took the main weight of the model and four supported the corners. Below the white acrylic, I set up three open flash tubes (bare bulbs) on the white paper.
REFLECTOR - Material used to reflect light onto a subject. A flash reflector is a shiny surface situated behind the flash tube that reflects light in a specific direction.
Tip: Modeling lights are not universally proportional to the Intensity of the flash tube. A truly "proportional" halogen model-ing light must be centered, diffused, and modulated to the various power levels of the flash.
As a general rule, the higher the number, the greater the blue hues; the smaller the number, the greater red hues. Fluorescent lighting fills a range from 3500 K to 6200 K depending on its use. Flash tubes are often daylight balanced.
Once sufficiently charged a 'ready light' comes on. As the shutter release is pressed a charge is sent across a gas filled flash tube. The sudden high voltage ignites the gas producing a bright flash for a split second.
Stores electrical energy supplied by a power source and can discharge it more rapidly than the source itself. Used in flash equipment, providing reliable bulb firing even from weak batteries, and supplying the surge needed for electronic flash tubes.
They generally have one or more lightweight heads containing the flash tubes that connect by high-voltage cables to a separate power pack that powers and controls the light.
 See also: Flash, Light, Camera, Photograph, Photography
  
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