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(ɪˌlu məˈnɒm ɪ tər)

an instrument for measuring illumination.
[1890–95; illumin (ation) + -o- + -meter]
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The intensity of the incandescent bulb at 240 lux was determined by an illuminometer (DT-1309, CEM, Shenzhen, China) at the height of the chickens' eye.
The illuminometer is used to measure light amount of UV light, but since the illuminometer can only measure the amount of UV light of single points, it was difficult to measure the amount of UV light of the entire irradiated surface to see if UV light evenly irradiated the subject.