31.01.2015
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Incandescent light sources, including older versions with tungsten and carbon filaments, as well as the newer, more advanced tungsten-halogen lamps, have been successfully employed as a highly reliable light source in optical microscopy for many decades and continue to be the one of the illumination mechanisms of choice for a variety of imaging modalities. Several varieties of tungsten-halogen lamps are now the default incandescent illumination source (and are provided by the manufacturer) for most of the teaching and research-level microscopes marketed around the world.
The first commercial incandescent lamps equipped with tungsten filaments were introduced in the early 1900s. Tungsten-halogen lamps were first developed in the early 1960s by replacing the traditional glass bulb with a higher performance quartz envelope that was no longer spherical, but tubular in shape. As previously discussed, in traditional incandescent lamps, vaporized gaseous tungsten from the filament is transported through the vapor phase and continuously deposited on the inside walls of the glass bulb.
The halogen regenerative cycle can be dissected into three critical steps that are outlined in Figure 2. The benefits of the halogen regenerative cycle include the ability to use smaller envelopes that are maintained in a clean, deposit-free condition during the life span of the lamp. Early investigations revealed that the addition of fluoride salts to the vapor sealed inside tungsten-halogen lamps produced output with the highest level of visible wavelengths, and also deposited recycled tungsten on regions of the filament with higher temperatures.
Tungsten-halogen incandescent lamps operate as thermal radiators, meaning that light is generated by heating a solid body (the filament) to a very high temperature.
A significant portion of the electrical power consumed by incandescent tungsten wire filaments is output in the form of electromagnetic radiation spanning the wavelength region between 200 and 3000 nanometers. In the case of an ideal blackbody radiator, the perceived color temperature is equal to the true (measured) temperature of the radiator material. In summary, as incandescent radiators, tungsten-halogen lamps generate a continuous spectrum of light that ranges from the central ultraviolet through the visible and into the infrared wavelength regions (see Figures 1 and 3).


The photometric characteristics for evaluating the performance of light sources are somewhat unusual in that two systems of units exist in parallel to define the important variables associated with radiance and spectral output. Presented in Table 1 are electrical specifications, filament dimensions, typical life span, and the photometric output for several of the most popular tungsten-halogen lamps currently utilized in optical microscopy.
A wide variety of tungsten-halogen lamp designs incorporate integral reflectors that serve to efficiently gather light wavefronts emitted by the lamp and direct them into the illumination system in an organized manner.
Reflector lamps are generally connected to lamp holders with molybdenum pins projecting outwards from the rear of the reflector and mounted with ceramic covers. Tungsten-halogen reflectors are designed to either focus or collimate light emitted by the lamp, as illustrated in Figure 4. If the entire spectrum of radiation emitted by the lamp is required, or in cases where infrared light is useful, metal reflectors or glass reflectors with a thin gold coat are the optimum choice. The basic anatomy of a single-ended tungsten-halogen lamp commonly used for illumination in optical microscopy is illustrated in Figure 5. The excessively high operating temperatures of tungsten-halogen lamps require substantially stronger and thicker transparent envelopes than conventional tungsten and carbon lamps. One of the critical factors in the fabrication of tungsten-halogen lamps is sealing the internal elements to isolate them from the external atmosphere. Because tungsten-halogen lamp fabrication technology is so well advanced at this point, the life of a typical lamp ends suddenly, usually upon powering up a cold lamp filament. Tungsten-halogen lamps can be operated using power supplies with either direct or alternating current, but most research-level microscopy applications use direct current (DC) power supplies. Illustrated in Figure 6 is a typical 100-watt tungsten-halogen lamphouse used in transmitted light microscopy applications. Maintaining a tan has never been easier, 1-2 visits a month will sustain the dark golden results you crave. The P90 features 4 levels of facial tanning, 3 levels of body intensity tanning and shoulder tanners.
From the manufacturer known for producing the world’s most luxurious tanning beds comes the world’s finest tanning bed ever made!
The Lotus tanning bed by UWE features 160 watt tanning and 3 400 watt high pressure facial lamps.
Our stand-up booths enable you to get a 360 degree tan in a hygiene-rich environment…you tan faster and eliminate any risk of body fluid contamination. If the item comes direct from a manufacturer, it may be delivered in non-retail packaging, such as a plain or unprinted box or plastic bag.
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Import charges previously quoted are subject to change if you increase your maximum bid amount.
Davidson - National High Magnetic Field Laboratory, 1800 East Paul Dirac Dr., The Florida State University, Tallahassee, Florida, 32310.
While low-pressure tanning beds require 10-15 visits to establish a base tan, a high-pressure bed only requires 3-4 sessions at a maximum tanning time of up to 12 minutes.
Three levels of body and facial fans along with a self container air conditioner give you control for a comfortable tanning temperature. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. Import charges previously quoted are subject to change if you increase you maximum bid amount. Supplying the correct amounts of heat is crucial for its health and well-being.Fortunately, there are many companies that manufacture products that work well for sustaining proper heat levels.
Tantimes in the Lotus are a maximum of 12 minutes and the bed is solidly constructed with molded aluminum extrusions and frosted acrylics. With full high pressure tanning lamps on top and full length body lamps on the lounge, the P-90 is simply a combo of the iBed and the Sunboard with a little extra horsepower. The result is a wonderful mid-level tanning bed that looks great and is extremely reliable.
The Lotus tanning bed and UWE the manufacturer are based in Germany and have the quality fit and finish one would expect from UWE. There are also Mercury Vapor bulbs and ceramic heat emitters that can be used to provide radiant heat.Heat lamps are mostly used to create basking areas for the bearded dragon.
Basking areas are where the bearded dragon will lay, or perch, during daytime hours in order to receive heat and ultraviolet rays just as it does in the wild.The higher the wattage of the heat lamp, the greater amount of heat it produces. For example, a 100 watt bulb will produce more heat than a 60 watt bulb.What wattage bulb you will need depends greatly on the size of the habitat. This heat lamp is ideal for creating basking areas, and comes in wattages ranging from 50 watts (for small terrariums) to 150 watts (for very large terrariums).A heat lamp may also be needed for keeping nighttime temperatures from dropping below 65 degrees F. There are many nighttime bulbs made to provide heat while creating subdued levels of light.
This is important because you do not want to use a daytime bulb at night because your pet will not be able to sleep properly.Undertank Heat PadsUndertank Heat Pads are a great way to supply a gentle heat from underneath the habitat. The most common application is to wrap decor pieces with the tape to provide additional heat.



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