UV Lamps and Optical Filters

UV Testing Lamps
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UV Testing Lamps Q-SUN BO2 Lamp Q-SUN Filter Application Table Q-SUN product line Q-SUN Xe-3 tester’s air-cooled lamp QUV tester lamps Optical filters Xenon arc lamps QUV UV Lamps
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UV light is responsible for almost all photodegradation of durable materials exposed outdoors. The QUV tester’s fluorescent lamps simulate the critical short-wave UV spectrum and reproduce the physical property caused by sunlight. Several different types of UV lamps are available for different applications, and optical filters are not required.

The Q-SUN family of xenon-arc testers uses xenon-arc lamps to produce the most realistic reproduction of full spectrum sunlight including UV, visible light, and infrared radiation. For many materials, exposure to the full spectrum is necessary to provide an accurate simulation, especially when testing for color change and lightfastness. However, xenon light must be properly filtered to achieve the appropriate spectrum for each particular application. Differences in spectra may affect both the speed and type of degradation.


QUV Ultraviolet Fluorescent Lamps
All of the QUV tester's lamps emit mainly ultraviolet rather than visible or infrared light.  All are electrically equivalent to an ordinary 40-watt fluorescent.  However, each lamp type differs in the total amount of UV energy emitted and in its wavelength spectrum.  Fluorescent UV lamps are usually categorized as UV-A or UV-B lamps, depending on the region into which most of their output falls.  

UV-A lamps are especially useful for comparing different types of polymers.  Because UV-A lamps do not have any UV output below the normal solar cutoff of 295 nm, they usually do not degrade materials as fast as UV-B lamps.  However, they usually provide better correlation with actual outdoor weathering.

UV-B radiation includes the shortest wavelengths of sunlight found on the earth’s surface.  Consequently, fluorescent UV-B lamps are widely used in QC and R&D for fast, cost-effective results.  Because all UV-B lamps emit unnatural, short-wavelengths of UV that are below the solar cutoff of 295 nm, anomalous results can occur. Two types of UV-B lamps are available.  They emit different amounts of total energy, but produce the same UV wavelengths in the same relative proportions.

Q-SUN Full Spectrum Xenon Arc Lamps
Xenon arc lamps give the ultimate correlation to the full spectrum of natural sunlight.  Unlike the QUV tester whose lamps directly determine the radiation that specimens see, the Q-SUN tester requires optical filters to accomplish the same.  These optical filters are used to simulate a variety of service environments including direct sunlight and sunlight through window glass.  Filter performance does not decline with age; therefore, filters do not need to be replaced unless the glass is broken.

The Q-SUN Xe-2 model’s optical filter lantern is designed to produce the spectra specified in ISO and AATCC test methods and is equivalent to sunlight coming through window glass. The lantern consists of an outer borosilicate cylinder and two sets of 7 inner filters, arranged in a two-tier heptagon.

There are three general categories of filters which can be used in the Q-SUN Xe-1 and Xe-3 xenon test chambers.  The choice of filter depends upon the material tested and its end-use application.  Within each general category, there may be several different types of filters.  Each filter is a flat piece of specialty glass specifically designed to have a particular transmission.  

Because the radiation from an unfiltered xenon arc contains too much short-wave UV to allow useful correlation to natural exposures on the earth’s surface, Q-SUN testers employ various types of filters to reduce unwanted radiation and achieve an appropriate spectrum.  For most of the filter types used, the greatest effect is on the short wavelength portion of the spectrum.  Because the damaging effects of UV are inversely proportional to wavelength (i.e., shorter wavelengths = more damaging), it is critical that the cut-on wavelength match the service environment.

Low Cost Replacement Lamps and Filters for Atlas Weather-Ometer® Testers
Q-Lab offers water-cooled replacement lamps and optical filters for use in Atlas Weather-Ometer® models Ci35, Ci35A, Ci65, Ci65A, Ci4000, Ci5000, and SUNTEST CPS and CPS+.  These replacement lamps and filters are lower in cost and guaranteed to have a comparable spectral power distribution to those supplied by Atlas.

®Weather-Ometer is a registered trademark of Atlas Material Testing, LLC

QUV Lamps
Q-Lab supplies the highest quality UV fluorescent lamps available. The technology behind the lamps produces a spectrum that is inherently stable throughout their use. Each manufacturing lot is required to pass a stringent series of tests before it is approved for sale. The result is that the QUV tester provides a consistent, stable spectrum, year after year.

Several different types of UV lamps are available for different applications; part numbers are listed below. See the QUV Tester Page, Lamps Tab for more detailed information.

QUV Lamp Part Numbers (excluding QUV/basic)
  • UVA-340     QUV UV-A 340nm Lamp (replace every 8000 hours or when set point can't be maintained)
  • UVB-313     QUV UV-B 313nm Lamp (replace every 8000 hours or when set point can't be maintained)
  • QFS-40       QUV QFS-40 (F40 UV-B) Lamp (replace every 8000 hours or when set point can't be maintained)
  • UVA-351     QUV UV-A 351nm Lamp (replace every 8000 hours or when set point can't be maintained)
  • Cool White QUV Cool White Lamp (replace every 8000 hours or when set point can't be maintained)

Q-SUN Xenon Arc Lamps

The Q-SUN Xe-1, Xe-2 and Xe-3 testers’ xenon arc lamps produce the most realistic reproduction of full spectrum sunlight including ultraviolet, visible light and infrared radiation. For many materials, exposure to the full spectrum is necessary to provide an accurate simulation, especially when testing for color change and lightfastness.

Air-cooling makes the Q-SUN xenon arc lamps economical, efficient and low maintenance.  Lamps last for 1500 hours; the Q-SUN Xe-1 and the Xe-2 use a single 1800W lamp per machine, while the Q-SUN Xe-3 uses three.  Common Q-SUN lamp part numbers are listed below.  See the Q-SUN Tester Pages, Lamps Tabs for more detailed information.

Q-SUN Lamp Part Numbers
  • X-1800         Q-SUN Xe-1 & Xe-3 Xenon Arc Lamp (replace every 1500 hours)
  • X-1850         Q-SUN Xe-2 Xenon Arc Lamp (replace every 1500 hours)

Low Cost Replacement Lamps for Atlas Weather-Ometer® Testers
Q-Lab offers water-cooled replacement lamps for use in Atlas Weather-Ometer® models Ci35, Ci35A, Ci65, Ci65A, Ci4000, Ci5000, and SUNTEST CPS and CPS+

These low cost water-cooled replacement lamps are guaranteed to have a comparable spectral power distribution to original lamps supplied by Atlas.  The lamps meet a wide range of ISO, ASTM, SAE, and AATC requirements.

Atlas Weather-Ometer® Lamp Part Numbers
  • X-6500         6500 Watt Xenon Arc Lamp (Atlas part #20-6500-00 for Ci35, Ci35A, Ci65, Ci65A, and Ci4000)
  • X-12000       12000 Watt Xenon Arc Lamp (Atlas part #20-3053-00 for Ci5000)
  • X-1500          1500 Watt Xenon Arc Lamp (Atlas part #56-0017-94 for CPS and CPS+)
®Weather-Ometer is a registered trademark of Atlas Material Testing, LLC

QUV Optical Filters
Unlike xenon arc test chambers, the QUV tester does not require the use of any optical filters.

Q-SUN Optical Filters
Xenon light must be properly filtered to achieve the appropriate spectrum for each particular application.  Differences in spectra may affect both the speed and the type of degradation.  Three categories of filters are available to simulate a variety of service environments.  The application or test method dictates which filters should be used.  Below are some useful part numbers.  See the Q-SUN Tester Page, Optical Filter Tabs for more detailed information. 

Q-SUN Optical Filter Part Numbers
  • X-7460      Q-SUN Xe-1 & Xe-3 Daylight-Q Optical Filter
  • X-10271    Q-SUN Xe-1 & Xe-3 Daylight-BB Optical Filter
  • X-10586    Q-SUN Xe-1 & Xe-3 Daylight-F Optical Filter
  • X-10266    Q-SUN Xe-1 & Xe-3 Window-Q Optical Filter
  • X-10214    Q-SUN Xe-1 & Xe-3 Window-B/SL Optical Filter
  • X-10857    Q-SUN Xe-1 & Xe-3 Window SF-5 Optical Filter
  • X-10110    Q-SUN Xe-1 & Xe-3 Window-IR Optical Filter
  • X-10180    Q-SUN Xe-1 & Xe-3 Extended UV-Quartz Optical Filter
  • X-6502      Q-SUN Xe-1 & Xe-3 UV-Q/B Optical Filter
  • XR-11234-K    Q-SUN Xe-2 Window-B/SL Filter Lantern (AATCC), 14 Inner Window-B/SL & 1 Borosilicate Outer
  • XR-11233-K    Q-SUN Xe-2 Window-IR Filter Lantern (ISO), 14 Inner Window-IR & 1 Borosilicate Outer
  • XR-11232-K    Q-SUN Xe-2 Window-IR Inner Filter Replacement Kit, set of 2
  • XR-11575-K    Q-SUN Xe-2 Daylight-F Optical Filter Lantern

Low Cost Replacement Filters for Atlas Weather-Ometer® Testers
Q-Lab offers replacement optical filters for use in Atlas Weather-Ometer® models Ci35, Ci35A, Ci65, Ci65A, Ci4000, and Ci5000.

These low cost replacement filters are guaranteed to have a comparable spectral power distribution to original filters supplied by Atlas.  The filters meet a wide range of ISO, ASTM, SAE, and AATC requirements.

Atlas Weather-Ometer® Filter Part Numbers 

  • X-10893-K     Boro Outer Filter (For Ci35/Ci65) 
  • X-10888-K     Boro Outer Filter (Atlas part #20-2796-00 for Ci4000)   
  • X-10894-K     Boro Outer Filter (Atlas part #20-3128-00 for Ci5000)
  • X-10891-K     Boro Inner Filter (Atlas part #20-2341-00  for Ci35/Ci65 and Ci4000)   
  • X-10892-K     Boro Inner Filter (Atlas part #20-3132-00 for Ci5000)   
  • X-10889-K     Quartz Inner Filter (Atlas part #20-6506-00 Ci35/Ci65 and Ci4000)   
  • X-10890-K     Quartz Inner Filter (Atlas part #20-3133-00 Ci5000)              

®Weather-Ometer is aregistered trademark of Atlas Material Testing, LLC

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