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F20T12 Fluorescent Black Light Blue Bulbs

F20T12 fluorescent black light blue for lots of special lighting effects.
Price Each: $12.54

Item Number: BLF12278
F20T12 fluorescent black light blue fluorescent bulbs are the typical lamp used for several types of effects including the most common one which are black light posters and effects. The sizes vary on length and diameter but all have that special deep purple appearance when unlit. This particular one is 20 watt and has a 1 1/2 inch diameter tube which is a T12 lamp. It's an older style of bulb and continues to be made for replacement purposes. With a length of only 2 feet long from pin to pin, you'll find these in many applications where you need a smaller light fixture and get the black lighting effect. It operates on a magnetic ballast which is the older style ballast as well. On occasion you will see these used with an electronic ballast but that is rare. Anywhere that you see a fixture that uses an F20T12, this bulb will work perfectly in it, it's electrically the same. Often the label will have a reference to BLB which means black light blue, and that's the fluorescent phosphor that used in this type of bulb. It's great for things like Halloween but also is used for many kinds of stage lighting effects such as night sky or special emphasis with color. There is also a 4 foot version which is the most common one and sometimes these are used together for a long linear stretches of light.

Product features:
- 24 inch overall length.
- 20 watt.
- Black light effects and stage effects.
- F20T12/BLB are some of the ways that these are labeled.


This article uses material from the Wikipedia article "Blacklight", which is released under the Creative Commons Attribution-Share-Alike License 3.0.

"Fluorescent black light tubes are typically made in the same fashion as normal fluorescent tubes except that a phosphor that emits UVA light instead of visible white light is used. The type most commonly used for black lights, designated blacklight blue or "BLB" by the industry, has a dark blue filter coating on the tube, which filters out most visible light, so that fluorescence effects can be observed. These tubes have a dim violet glow when operating. They should not be confused with "blacklight" or "BL" tubes, which have no filter coating, and have a brighter blue color. These are made for use in "bug zapper" insect traps, where visible light emission is not a problem. The phosphor typically used for a near 368 to 371 nanometer emission peak is either europium-doped strontium fluoroborate.

Manufacturers use different numbering systems for black light tubes. Philips uses one system which is becoming outdated (2010), while the (German) Osram system is becoming dominant outside North America. The following table lists the tubes generating blue, UVA and UVB, in order of decreasing wavelength of the most intense peak. Approximate phosphor compositions, major manufacturer's type numbers and some uses are given as an overview of the types available. "Peak" position is approximated to the nearest 10 nm.

Ultraviolet radiation is invisible to the human eye, but illuminating certain materials with UV radiation causes the emission of visible light, causing these substances to glow with various colors. This is called fluorescence, and has many practical uses. Black lights are required to observe fluorescence, since other types of ultraviolet lamps emit visible light which drowns out the dim fluorescent glow.

Black light is commonly used to authenticate oil paintings, antiques and banknotes. Black lights can be used to differentiate real currency from counterfeit notes because, in many countries, legal banknotes have fluorescent symbols on them that only show under a black light. In addition, the paper used for printing money does not contain any of the brightening agents which cause commercially available papers to fluoresce under black light. Both of these features make illegal notes easier to detect and more difficult to successfully counterfeit. The same security features can be applied to identification cards.

Other security applications include the use of pens containing a fluorescent ink, generally with a soft tip, that can be used to "invisibly" mark items. If the objects that are so marked are subsequently stolen, a black light can be used to search for these security markings. At some theme parks, nightclubs and at other, day-long (or night-long) events, a fluorescent mark is rubber stamped onto the wrist of a guest who can then exercise the option of leaving and being able to return again without paying another admission fee.

In medicine, the Wood's lamp is used to check for the characteristic fluorescence of certain dermatophytic fungi such as species of Microsporum which emit a yellow glow, or corynebacterium which have a red to orange color when viewed under a Wood's lamp. Such light is also used to detect the presence and extent of disorders that cause a loss of pigmentation, such as vitiligo. It can also be used to diagnose other fungal infections such as ringworm, microsporum canis, tinea versicolor; bacterial infections such erythrasma; other skin conditions including acne, scabies, alopecia, porphyria; as well as corneal scratches, foreign bodies in the eye, and blocked tear ducts.

Fluorescent materials are also very widely used in numerous applications in molecular biology, often as "tags" which bind themselves to a substance of interest (for example, DNA), so allowing their visualization. Black light can also be used to see animal excreta such as urine and vomit that is not always visible to the naked eye.

Black light is used extensively in non-destructive testing. Fluorescing fluids are applied to metal structures and illuminated with a black light which allows cracks and other weaknesses in the material to be easily detected. It is also used to illuminate pictures painted with fluorescent colors, particularly on black velvet, which intensifies the illusion of self-illumination. The use of such materials, often in the form of tiles viewed in a sensory room under UV light, is common in the United Kingdom for the education of students with profound and multiple learning difficulties. Such fluorescence from certain textile fibers, especially those bearing optical brightener residues, can also be used for recreational effect, as seen, for example, in the opening credits of the James Bond film A View to a Kill. Black light puppetry is also performed in a black light theater.

One of the innovations for night and all-weather flying used by the US, UK, Japan and Germany during World War II was the use of UV interior lighting to illuminate the instrument panel, giving a safer alternative to the radium-painted instrument faces and pointers, and an intensity that could be varied easily and without visible illumination that would give away an aircraft's position. This went so far as to include the printing of charts that were marked in UV-fluorescent inks, and the provision of UV-visible pencils and slide rules such as the E6B.

Thousands of moth and insect collectors all over the world use various types of black lights to attract moth and insect specimens for photography and collecting. It is one of the preferred light sources for attracting insects and moths at night.

It may also be used to test for LSD, which fluoresces under black light while common substitutes such as 25I-NBOMe do not."
Item Number: BLF12278

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