File:Two black light fluorescent tubes.jpg
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Summary
DescriptionTwo black light fluorescent tubes.jpg |
English: Two ultraviolet "black light" fluorescent tubes. The top one is a G.E. F15T8/BLB 18 inch 15 watt tube, used in standard plugin fixtures for special lighting effects, such as illuminating fluorescent posters. The bottom one is a F8T5/BLB 12 inch 8 watt tube, often used in portable battery-powered black light lamps for such uses as rock hunting, pet urine detection, and reading fluorescent security stamps. They emit long-wave (UVA) ultraviolet radiation, with a wavelength in the range 350 to 370 nm, which in general is not dangerous to the eyes or skin. These types of tubes, called in the lighting industry "blacklight blue", have an envelope with a deep blue-purple filtering material which filters out nearly all visible light from the inside, and passes ultraviolet. This filtering material was originally Wood's glass, a nickel oxide-doped glass, but because its physical characteristics made it unsuitable for light bulb envelopes, modern tubes use a filter coating on an ordinary glass tube. |
Date | |
Source | Own work |
Author | Chetvorno |
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. | |
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
Items portrayed in this file
depicts
28 October 2011
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 18:40, 29 October 2011 | 2,766 × 855 (511 KB) | commons>Chetvorno |
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Metadata
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Camera manufacturer | FUJIFILM |
---|---|
Camera model | FinePix E550 |
Exposure time | 1/85 sec (0.011764705882353) |
F Number | f/2.8 |
ISO speed rating | 100 |
Date and time of data generation | 23:26, 28 October 2011 |
Lens focal length | 7.2 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | GIMP 2.6.11 |
File change date and time | 00:19, 29 October 2011 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 23:26, 28 October 2011 |
Meaning of each component |
|
Image compression mode | 2 |
APEX shutter speed | 6.4 |
APEX aperture | 3 |
APEX brightness | 4.78 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 5,292 |
Focal plane Y resolution | 5,292 |
Focal plane resolution unit | 3 |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Scene capture type | Standard |
Sharpness | Normal |
Subject distance range | Unknown |
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