Catalogue - NOW Catalog - Atlas Material Testing Technology - (Version JPG)

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Weather station, Corrosion chamber, Concentrator, Test chamber

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33f Light Quality

What Light is Right?

Choosing the "right light" is one of the first steps in creating an accurate and reliable weathering test program. Atlas® accelerated weathering instruments offer a variety of light sources to simulate the effects of natural sunlight. We will work with you to select a light source with the spectral power distribution closest to your end-use environment, ensuring the most reliable and accurate results.

Sunlight vs. Artificial Light Sources

A Comparison of Relative Spectral Power Distribution

3.0

Global Solar Radiation

Average Miami Sunlight 26° South Direct.

• Xenon Arc Lamp

As used in an Atlas Weather-Ometer® with Right Light™ filters.

• UVA-340 Fluorescent Lamp

Commonly used in the Atlas UV2000.

• Metal Halide

As used in the SolarClimatic 340, 600, 1000 and 2000 systems equipped with MHG (Metal Halide Global) lamps.

• Sunshine Carbon Arc

As used in an

Atlas Weather-Ometer

with Corex D filters.

1 T

250 300 350 400 450 500 550 600 650 700 750 800

UV-B UV-A

280-315 nm 315-400 nm

VISIBLE

400-800 nm

Wavelength (nm)


Sunlight Measurements		300-400 nm	Irradiance Ranges W/m² 340 nm 420 nm 300-800 nm			300-2450 nm
Average Optimum Natural Daylight	Measured 45° South Cloudless Miami, FL	28	0.30	0.67	287
Peak Natural Daylight	Measured solar noon on Vernal Equinox at normal incidence Miami, FL	66	0.70	1.53	617
Peak Natural Daylight Standard	Defined for Horizontal Plane (0°) in CIE Publication No. 85 Table 4	69	0.68	1.50	669	1088

NOW Catalog - Atlas Material Testing Technology - #8

Weather station, Corrosion chamber, Concentrator, Test chamber