Sciencetech’s TH3 lamp housing allows for vertically mounted 50W-250W DC operated Quartz Tungsten Halogen (QTH) filament lamps. Such lamps produce a large VIS-NIR output and some UV light. The spectral output is smooth and approximates a 3300K black body. Since each wattage lamp has its own socket style, a QTH lamp housing may only accommodate the selected wattage lamp once the socket style is specified. The unit is forced air-cooled with a blower at the base that draws air from the top intake to the bottom of the housing. The lamp socket is mounted vertically on alignment pins such that the lamp’s filament can be properly centered to the housing’s back spherical reflector and front light exit port for optimum light output efficiency. The front light exit port includes a 1” (or optional 2") diameter borosilicate glass collimating lens to produce parallel rays. One QTH lamp (bulb) is included, but the stabilized power supply is external to the lamp housing and is sold separately.

Optical Configuration The QTH lamp is mounted in a vertical position with the exit port on the side wall. A back spherical reflector mounted on adjustable alignment pins redirects the rear illumination to the forward exit port thereby doubling the amount of light collected.

Beam Collimation A 1" (or optional 2") diameter collimating lens is mounted at the exit port of the QTH lamp housing to produce near parallel output rays (f/1.5). This lens is made of borosilicate glass and filters most harmful UV rays below 360nm. For UV applications, this lens can be replaced with a fused silica version which allows all wavelengths including UV light above 200nm to pass through. Please discuss this upgrade with a Applications Specialist.

Focusing Optics Refractive condensing optics can be attached to the exit port of the TH3 lamp housing to focus the light into a fine focal spot. Refractive condensing optics are excellent at condensing light into a small spot such as through a monochromator slit or into a fiber bundle. More importantly, refractive condensing optics can be set to any aperture value allowing it to better match the f number of the device it is illuminating for maximum light transfer efficiency. However, this aperture value must be specified at the time of ordering.

Optical Beam Height The center beam line of the exit port is 114.3mm above the base of the lamp housing. This can be too high for some optical systems. To lower the center beam line, the lamp housing can be rotated 90 degrees about its exit port such that it lies horizontally. An optional horizontal mounting bracket is available for this purpose. Although arc lamps should not be operated horizontally as that shortens its service life, this is not the case with QTH lamps. A QTH lamp can be operated either horizontally or vertically without affecting its service life.

Supported Lamps The TH3 housing supports 50W-250W Quartz Tungsten Halogen (QTH) lamps which also are sold separately. Since each QTH lamp wattage has its own socket style, it must be specified at the time of ordering (specify 50W, 100W, or 250W). The QTH lamp housing may not be able support another wattage lamp after it is manufactured.

QTH Lamp Rated Wattage QTH lamps are designed to be operated at its rated wattage. Overpowering them can cause them to prematurely burn out.

Power Supply The TH3 lamp housing is designed to work with a variety of Sciencetech fixed and variable QTH DC power supplies ranging from 50W to 250W. The TH3 lamp housing can also be used with other DC QTH lamp power supplies as long as the power supply provides both DC output for the QTH lamp and 120VAC output for its cooling fan.

Mating to Monochromator/Spectrograph with Possible Obstruction Please note that if a TH3 lamp housing is mated to the input port of a monochromator using a CON1-2L or CON2-2L condensing assembly (in either vertical or horizontal orientation), the physical size of the lamp housing may obstruct any detectors from being mounted to the output port of the monochromator/spectrograph. If this option is desired, please add a second side port (lateral port) to the monochromator/spectrograph so that the light housing can be mounted onto the side wall thus avoiding this obstruction.

Customization Sciencetech has built many customized versions of the TH3 lamp housing. Examples include a water cooled version, a 2" diameter output beam version, and a horizontally mounted version to lower its optical beam height to match that of a table top system. If you require a certain feature in this arc lamp housing that is not shown, please contact our Applications Specialists.

Technical Specifications

• 1" (25mm) (or optional 2") diameter exit port, with f/1.5 collimating lens
• 1-3/8" back spherical reflector to double light output (for both 1" and 2" optics)
• Removable top for lamp replacement
• Three point adjustable pins for back spherical reflector alignment
• Black anodized, aluminum body
• + and - terminals for lamp power (12DC-24DC typical)
• Live and neutral terminals for cooling fan (115-120VAC)
• Distance from center of lamp to exit port: 30mm
• Center beam line height: 114.3mm (4.5") above base
• Dimensions: 101.6 x 101.6 x 224mm (4" x 4" x 8.815")