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Ocean Optics
Worldwide Headquarters
Largo, Florida, USA

+1 727-733-2447

[email protected]

Sales, Service
& Support Facility
Duiven, The Netherlands

+31 26-319-0500
+33 442-386-588

[email protected]

Ocean Optics GmbH Sales,
Service & Support Facility
Ostfildern, Germany

+49 711-34-16-96-0

[email protected]

Sales Support
for the
United Kingdom

+44 1865-819922

[email protected]

Sales, Service
& Support Facilities
Shanghai, PRC – Beijing, PRC

+86 21-6295-6600

[email protected]


Is relative or absolute irradiance mode needed when comparing two scans?

Relative mode. Measurements taken with a single spectrometer are accurate relative to one another, even if the spectral shape is uncorrected. That means you can take the ratio of one emissive measurement to another and get an accurate change in the percent signal as a function of wavelength.

A good rule of thumb is this: Relative irradiance mode is needed when comparing measurements taken by different spectrometers, when determining the spectral shape, or when looking for peak location and shifts. Absolute irradiance mode is needed to quantify the amount of light.