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2024-04-18 18:05:57
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 mike-o
Location: Philadelphia
Gender: Male
Wake up little penguin... Penguintopia's open to the public
 |  |  | Xenon Lightbulb
< on 1/24/2004 3:44 AM >
|  | | | These new lightbulbs are brighter, more power efficient, and have a longer lifetime than conventional lightbulbs. They are being used for many things, the biggest being car headlights, but they are also being used in new flashlights.
The blueish tint from xenon bulb comes from their higher temperature of color expressed in Kelvin degrees, K° . Xenon gas filled bulb have a temperature around 6000°K, while sun light is around 5000 K° and a regular tungsten ligh: 3200 K°. The lower the temperature the warmer (orange) the light is, higher temperature means more blue tint. Our brain compensates for the difference between K° light sources, making us think they are all "white". The difference can be clearly seen on slide film, a bit less on negative film and on digital camera if you don't white balance the image.
[edit]
There are actually two different types of xenon bulb. One type is essentially a standard incandescent bulb, but filled with xenon gas instead of being evacuated or filled with a nitrogen/argon mixture. Xenon conducts less heat than the N/Ar mixture, and is also better at retarding evaporation of the tungsten filament (but not as effective as a halogen mixture). These bulbs produce a somewhat whiter and brighter light than vacuum bulbs, but not a bluish-white color unless the bulb is tinted.
The other type is a gas discharge lamp, where an arc is struck between two electrodes. The xenon discharge lamp is a specialized "short-arc" light that has very closely-spaced electrodes, producing a concentrated light source. There are also small metal-halide lamps, which contain a small amount of xenon to aid in starting the lamp; these are found in portable HID lights for diving, cycling, etc., and in automotive HID headlights. Welch-Allyn's Solarc lamps are of this type. The HID lamps generate the high-color-temperature light as a matter of course.
[last edit 1/24/2004 3:44 AM by Crispy Critter - edited 4 times]
UER is a great idea and I love the LDB... but this forum sucks my ass. later |
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