International Light Technologies has been featured in the newest study published on Nature.com 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
“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.