ILT1700 Radiometer Featured in New Scientific Study

International Light Technologies has been featured in the newest study published on on artificial light at night.

The study evaluates artificial light at night (ALAN), a major form of anthropogenic pollution, using the ILT1700 Research Radiometer (recently replaced by the ILT5000) for the purpose of measuring light intensity.

Read the entire study here:
Artificial Light at Night Affects Emergence from a Refuge and Space Use in Guppies

Partial excerpt:

“To confirm that our treatments indeed resulted in different light conditions, we used an ILT1700 Research Radiometer (range: 0.00167–1,670,000 lx, International Light Technologies, Peabody, MA) to measure light intensity. During the daylight period, we took 15 measurement points (arranged in a grid at the bottom of the tank) for each of the nine tanks by placing the SUD033/Y/W Underwater Broadband Silicon Detector (400–700 nm, photopic calibration) at the bottom of the tanks. The average daylight intensity for the three treatments were: control: mean ± SE = 4,607 ± 165 lx; dim light: 4,652 ± 143 lx; and bright light: 5,202 ± 165 lx. The average night-light intensity for the three treatments were: control: mean = 0 lx (Limited by the measurement range of the instrument. The light level was measured during the day to be below 0.035 lx, indicating a good level of shielding from ambient light.); dim light: 0.55 lx; and bright light: 5,202 lx. The spectra of the LEDs was measured using a spectro-radiometer with a measurement range of 250–1000 nm and 4.5 nm wavelength resolution (JETI Specbos 1211 UV, Jena Technische Instrumente, Jena, Germany). The LEDs had a strong emission peak in the blue spectrum near 450 nm (typical for GaN based LEDs) and a broadband emission centred at a wavelength of 560 nm (yellow-green spectrum; originating from the phosphor layer; Fig. 1). In the dim light condition, the spectrum altered in the way that the ratio of the blue peak and the broadband peak changed.“

For more information on the ILT5000 (previous model: ILT1700), click here.

Author(s): R. H. J. M. Kurvers, J. Drägestein, F. Hölker, A. Jechow, J. Krause & D. Bierbach
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