The 200-1K arc lamp housing produces a high power focused beam at its 4.5” diameter exit port which condenses into a small focal spot approximately 24cm in front of the port. An ellipsoidal reflector is used to collect light from the arc lamp and focus the beam. The housing is forced air-cooled with the arc lamp mounted in a horizontal position. For Hg-Xe lamps there is an additional shroud in the housing to make it cooler. The exit port is at the cathode end of the arc lamp and shines outwards through the front of the housing. Due to its horizontal layout, the 200-1K does not support mercury arc lamps. Instead, it supports 450W-1600W xenon and mercury-xenon arc lamps which are sold separately. Please specify the arc lamp wattage and type at time of ordering as the lamp socket and cooling shroud of the arc lamp housing is specific to the selected arc lamp.

Optical Configuration
Ellipsoidal reflectors are the most efficient geometric shape for collecting light from a point source and refocusing it to another focal point some fixed distance away. Since an arc lamp is not a perfect point source, the resulting focal spot size is not infinitesimally small. Practically speaking, it is about 7-10mm in diameter depending on the wattage and arc gap size of the arc lamp itself. Another restriction of the model 200-1K arc lamp housing is its fixed aperture as determined by its f/2.5 ellipsoidal reflector. For optimum light transfer, the component being illuminated should have a matching aperture value. Fortunately, Sciencetech manufactures sample chambers and monochromators/spectrographs that also have an f/2.5 input aperture. For such components, the 200-1K is an ideal light source for its efficient light collection and optimal light transfer capability. However, it is still not recommended for applications that require a very small focal spot. The 201-1k arc lamp housing can be used to create a smaller focused spot when used with lenses to focus the collimated output beam.

Performance
The output light has been fully characterized including measurements of total broadband power in UV, Visible and IR spectrum, as well as spatial intensity profiling of the focal spot. Please contact a Sciencetech Applications Sales Specialist at sales@sciencetech-inc.com to view these technical reports.

Energy at Focal Spot
Using a 1000W xenon lamp, it can generate over 80W of broadband photon power at the focal spot, with 26W-33W in the visible spectrum (400nm-700nm) alone. Such power produces a lot of heat. For example, a customer once put a holographic diffuser that is rated for 500ºC at this focal spot using a 500W xenon lamp. Despite its high heat tolerance, the filter was destroyed.

Comparing with model 201-1K
The difference between the 200-1K and 201-1K high power arc lamp housings is the geometry of the output beam. The 200-1K outputs a focused beam while the 201-1K outputs a collimated beam. However, the 201-1K can also output a focused beam by attaching refractive condensing optics to its exit port. The advantage of the Model 200-1K is its efficient light collection ability which allows it to focus more power onto a point. The advantage of the model 201-1K (with refractive condensing optics so that it also generates a focused beam) is its smaller focal spot, ability to generate any f number aperture by attaching different refractive condensing optics, and a more uniform beam. For very fine focal spot applications, the 201-1K actually achieves higher power density than the 200-1K.

Safety Exit Port Window
The exit port is covered with a 4.5" diameter G1 quartz window to filter out harmful UVB rays. However, UVA rays down to 270nm can still go through. If no UV rays are desired, an optional BK7 glass safety window is available to filter out most harmful UV rays below 360nm. For UV applications, this G1 safety quartz window can also be replaced with an optional fused silica version which allows all wavelengths including UV light above 200nm to pass through. These safety windows also protect the user against glass shrapnel should the high pressure arc lamp explode inside.

Ellipsoidal Reflector
The f/2.5 ellipsoidal reflector is the most expensive component of the arc lamp housing and accounts for over 50% of its manufacturing cost. It is made of a precision diamond turned solid aluminum piece to bear the exact geometry of an ellipsoidal surface for accurate refocusing of the arc lamp light to the small focal point in front of the housing. It is also thermally balanced to assure it does not warp under tremendous heat from the arc lamp as the interior of the arc lamp housing can reach 200ºC. It is also specially coated to reflect all wavelengths ranging from ultraviolet to infrared.

Cooling
The interior of the 200-1K arc lamp housing is hot enough to boil water. To keep it cooled, a blower at the top draws air from the back of the housing and blows it over the arc lamp. Please note that forced air-cooling should not be used on ozone producing arc lamps as it would blow the corrosive and hazardous ozone gas to the outside work environment. For ozone producing lamps, a water-cooled option is available such that the ozone can remain inside the arc lamp housing. In addition, this air cooling fan is typically set for 240VAC input voltage which matches the input voltage requirement of 1000W and 1600W power supplies. If a 500W power supply is ordered with an input voltage of 120VAC, then the cooling fan of this housing has to be set for 120VAC as well. Please specify this 120VAC option when placing the order.

Optical Beam Height
The center beam line of the exit port is 114.3mm (4.5") above the base of the lamp housing.

Supported Arc Lamps
The arc lamp is mounted in a horizontal position inside the 200-1K. The exit port is at the cathode end of the lamp and shines horizontally outwards. Due to this orientation, mercury arc lamps are not recommended as their service life is greatly shortened in horizontal operation. The service life of xenon arc lamps are not affected by orientation. The 200-1K accommodates short arc lamps ranging from 450-1600W which are sold separately. Since each arc lamp type and wattage has its own socket style and cooling shroud requirement, it must be specified at the time of ordering. The arc lamp housing will not be able support another type or wattage of arc lamp after it is manufactured unless the optional “Interchangeable Xe and HgXe Lamps Modular Adapter” is ordered.

Power Supply
The 200-1K arc lamp housing is designed to work with Sciencetech model 500-500 (500W), 500-1K (1000W), and 500-1.5K (1500W) adjustable power supplies with built-in igniters. These power supplies are highly stabilized switching DC power supplies that can be adjusted above or below its rated power. For example, the 500W power supply can be adjusted between 350W-500W, the 1000W power supply can be adjusted between 800W-1200W and the 1500W power supply can be adjusted between 1000W-1900W. An optional Optical Feedback Unit (Model FS-02) with a built-in fiber optic light sensor is also available to monitor the light intensity of the arc lamp and automatically adjust the power supply to maintain a consistent non-fluctuating intensity. The 200-1K arc lamp housing can also be used with other non-Sciencetech DC arc lamp power supplies as long as the power supply provides both DC output for lamp (typically 17-35VDC) and a separate 220-240VAC for its cooling fan. The power supply must also have its own arc lamp ignition.

Please note that Sciencetech's 500-500 (500W), 500-1K (1000W), and 500-1.5K (1500W) power supplies are designed for 220-240VAC input. However, the 500-500 (500W) power supply can also be operated at 120VAC, but the cooling fan inside the arc lamp housing would need to be converted to 120VAC as well. Please order product code 20X-1K-CF120VAC for this 120VAC cooling fan conversion.

Cable Connection
There are three cable connections to the arc lamp housing. The positive and negative lamp terminals on the arc lamp housing are Superior Electric Supercon RP50G connectors which are recessed male connectors. The lamp cables that connect to them require Superior Electric Supercon PS50GB/PS50GR connectors. Please note these cable connectors have female ends for safety purposes. A separate 230VAC/120VAC cable powers the arc lamp housing cooling fan which plugs directly into an electrical wall outlet. This cooling fan cable also includes the safety ground connection to the housing.

Other Arc Lamp Housing Models
Please consider the 200-100 arc lamp housing for lower wattage lamps between 75W-200W. The 200-100 has the same ellipsoidal reflector design as the 200-1K for efficient light collection and focused output beam. Also available is the 201-1K arc lamp housing that produces a collimated parallel output beam. The 201-1K supports the same set of 450W-1000W arc lamps and is compatible with the same models 500-500 and 500-1K adjustable power supplies as the 200-1K. The 201-1K is less efficient in light collection, but can achieve a smaller focal spot of any f number with refractive condensing optics attachments and produces a more uniform intensity beam.

Customization
Sciencetech has built many customized versions of the 200-1K arc lamp housing. Examples include an f/4 ellipsoidal reflector version, a vertically mounted version for mercury lamps, and even a gold coated reflector version for IR applications. If you require a certain feature in this arc lamp housing that is not shown, please contact our Applications Specialists at sales@sciencetech-inc.com for a custom quotation.

Technical Specifications

• 5.5" diameter diamond turned ellipsoidal reflector
• 4.5" diameter exit port with standard G1 quartz safety window
• UV fused silica safety window available
• BK7 glass safety window available
• Ellipsoidal reflector aperture: f/2.5
• Approximate focal spot location: 239mm in front of exit port
• Spot Size: 9mm for 1000W Xe lamp
• Removable back panel for lamp replacement
• Painted aluminum body
• + and - terminals for arc lamp (use superior electric supercon PS50B connectors)
• Live and neutral terminals for cooling fan (220-240VAC)
• 230-240VAC requirement for 1000W and 1600W models
• 120VAC or 240VAC requirement for 500W models (please specify)
• Center beam line height: 114.3mm (4.5") above base
• Dimensions: 470 x 216 x 222mm (18.5" x 8.5" x 8.75") (LxWxH)