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 Click on the parts below to find out more information.
When a broadband light source in the ultraviolet-visible-near infrared portion of the spectrum is required, an arc lamp has no peer. The intensity of an arc lamp is extremely high and, depending on the lamp, reasonably continuous throughout the region from 240 to 1200 nanometers. Usable intensities are available in the deep UV to 180 nm and in the near infrared to 2500 nm.
Unfortunately, most users of arc lamps are throwing away as much as 90 % of the output, due to poor collection efficiency. A good lamp housing design will account for the radiation pattern of the arc lamp, and collect the majority of the lamp’s output. But it doesn't stop there! Other considerations include: reflector stability, lamp ignition and power supply stability.
We believe that our long experience in light source design is what allows us to give you this unique light source: powerful—not through brute force but through efficient engineering, stable—constant output intensity, small—1/10 of comparable systems, environmentally friendly—ozone protected and inexpensive—volume production.
The compact high intensity light source includes: the lamp housing and adapter, regulated power supply and igniter; just select the desired focal length optics, lamp and window.
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At the heart of virtually every OBB Light Source is a proprietary on-axis ellipsoidal reflector. Our reflectors collect up to 70 % of the radiant energy from the arc lamp—vs 12 % for typical condenser systems. The ellipse literally wraps around the arc lamp, collecting 5 to 6 times more output power than from a conventional system.
The arc source is located at one focus of the ellipse, and the radiation is reflected by the ellipse to the other focus. Since the light is brought to a focus by reflection rather than refraction (through a lens), there are less losses from absorption or lens-surface back-reflection. Since it collects light more efficiently, and focuses it more effectively, an OBB Lamp housing produces up to 11 times more power into a given smaller area than a conventional design. This is critical whether illuminating light guides, monochromator slits, pinholes or other small areas.
What this means is simply that you get the same output with an OBB 75 W system as with a conventional 450 W system. You obviously will save money and space.
Our elliptical reflectors are proprietary in design and the coating used. They are NOT electro-formed reflectors, which can distort with heat, and can degrade within months. Our proprietary design ensures that distortion of the critical ellipsoid does not occur as the lamp reaches its operating temperature. This ensures thermal stability of focus. The coating ensures reasonably long operating life—typically 2–3 years.
While conventional lamp housings resemble chimneys emitting ozone and requiring cumbersome venting, the OBB compact high intensity light source has a sealed lamp housing that requires no ozone venting.
Ignition noise can disrupt, or even destroy, sensitive equipment in the vicinity of an Arc Lamp during start-up. This can be quite a concern in a crowded lab environment. OBB Engineers introduced an igniter that is integrated onto the lamp housing. This design provides an effective EMI shield which contains the EMI pulse, providing a safer and more convenient environment to do your research in.
The lamp housing includes an adaptor that will accommodate either a 75 W Xenon or 100 W Mercury lamp (OBB Corp specified or supplied). An optional 150 W Xenon lamp adaptor is also available.
What is not included but required are a: (choice of three), (choice of three) and . Here you have choices depending on your requirements.
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Lamp power capacity: 75 to 150 watts
Height: 100 mm (3.9 inches)
Width: 100 mm (3.9 inches)
Length: 210 mm (8.3 inches)
Weight: 1.9 kg (4.2 pounds)
Window diameter (D): 65 mm |
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Note: There are M5 or 8/32 tapped holes on the bottom of the lamp housing to allow mounting of the housing to mounting posts.
Note: 75 W Xenon and 100 W Mercury lamps are air-convention cooled. There is no need for water cooling.
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 The lamp power supplies are highly-regulated DC units that provides very stable power for xenon and mercury lamps. Designed for use with various lamp housings, they may be used with lamp housings from other manufacturers.
For 75 W–150 W Xenon and 100 W Mercury Lamps
Input (user selectable): 105–120 V/60 Hz or 210–240 V/50 Hz
Power rating: 0 to 150 watts
Operating voltage: 10 to 24 volts
Operating current: 0 to 8 amps
Pre-Ignition voltage: > 85 volts
Ripple at maximum current: < 10 milli-volts
Stability after warm-up: 0.2 %
Line voltage regulation: 0.1% current variation for 5 volts line change
Load regulation: 0.1% current variation for 50 % change in load impedance
Dimensions: 4.5 X 10.75 X 12.5 inches, 11.5 X 27.3 X 31.8 cm
Weight: 12 pounds, 5.45 kg
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You have a choice of three different reflectors. The proprietary reflectors OBB Corp uses allows for the great 70 % collection efficiency. In addition to collection of light the reflectors are used as focusing elements. Hence the selection of a reflector determines the focal length. The different focal lengths correspond to the different “focal cones” of light coming from your lamp housing. This “focal cone” is variously referred to as f/#, Numerical Aperture, and/or acceptance, convergence, or divergence angle.
The f # is important when considering matching a light source to some other component, for example: fiber optics, liquid light guides or monochromators.
The spot size at the focus is directly related to the original arc size of the lamp and the focal length of the reflector. The larger the arc, or the longer the focal length, the larger the spot size at the focus. Hence if you want to have the maximum power in the smallest spot select the fastest focal length (f/1) and the smallest arc size lamp (100 W Mercury). This is another unique benefit of the OBB Corp’s system; we give you the most power in the smallest spot. No one using an arc lamp can match us in this regardless of their systems size or cost.
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f/4.5 reflector |
f/2.5 reflector |
f/1 reflector |
| Focal length (F) |
379 mm |
240.5 mm |
112 mm |
| Focal point from housing (X) |
286 mm |
152 mm |
23 mm |
| Beam angle (a) |
12.7 degrees |
22.6 degrees |
53.1 degrees |
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You have a choice of lamps depending on the spectral output that you require. Of course you may order more than one of the lamps, they are interchangeable.
There are two types of arc lamps available—xenon and mercury. The xenon gas used in the lamp provides continuous spectra from 180 nm to 2,500 nm of course at varying intensity (refer to spectral output graph). The mercury provides a line spectra (refer to spectral graph). The spectral curves for xenon and mercury are normalized (relative intensities) therefore it is not obvious that the mercury lamps, intensity—where it emits, exceeds that of the xenon lamp. Because of the smaller arc size, the mercury lamp can also provide greater intensity in a smaller area (greater brightness) than the xenon lamp.
The normal envelope for most lamps is quartz—which generally cuts off the deep UV below 240 nm, but it also eliminates ozone. In case of our lamp housing, because it is sealed, ozone is not a safety hazard. Therefore in case where you require spectral output from 180 to 240 nm (for xenon lamps only), you can order a lamp with a suprasil envelope.
The standard system comes with an adaptor for 75 W xenon and 100 W mercury lamps (the adaptor is the same for both). If you desire to operate a 150 W xenon lamp you will need to get either an extra adaptor (if you plan to operate it in addition to the lower wattage lamps) or a substitute, 150W lamp adaptor in place of a 75 W one.
Although a 150 W xenon lamp has twice the power rating, it does not always mean that you will get twice the usable power. Because of the compact arc size of the 75 W xenon and 100 W mercury lamp they are much better point source (smaller arc size) and will provide much more power into a small area—like for example when you want to illuminate a narrow slit on a monochromator, or illuminate a small fiber optic element or liquid light guide.
If you want to illuminate small areas, typically 1 mm and below, the smaller wattage lamps provide you with more power in that area, than a 150 W lamp would. Obviously if you are interested in illuminating an area above 2 mm, the 150 W lamp will give you more power than a 75 W lamp.
If you want to collimate the output from the lamp, use the smaller lamps because they are point sources will give you better collimation.
The 150 W lamp, because of the sealed housing used will require water-cooling and there is provision on the lamp housing for water cooling. You can either get your water directly from the cold-water tap (can be a problem if the water is hard or when water is not available) or from an inexpensive circulating water bath option that we provide.
We have selected water-cooling over air: because it allows us to make a more compact housing; seal in the ozone and eliminates the need for venting.
Due to bulb geometry, the 150 W lamp will not work with f/1 or f/ 2.5 reflector.
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You have a choice of windows, depending on the lamp that you select and on the spectral output that you need. Please refer to the transmission spectra of the three types of windows available.
If you plan to use different types of lamps in your lamp housing, you may want to order different windows or select Suprasil since it will transmit all spectra.
| (click on image to enlarge) |
| Above 350 nm |
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| Above 250 nm |
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| Above 180 nm |
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You have an option to select from three different adaptor tubes, that must correspond to the f- number of your reflector. The adaptor tubes attach as extensions to the lamp housing to shroud the beam and to provide mounting surfaces at the focal plane of the lamp.
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Note: There are M5 or 8/32 tapped holes on the bottom of the lamp housing to allow mounting of the housing to mounting posts.
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