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The Universal Light Meter (ULM) is a hand-held instrument designed to measure Lux and UV and display the readings in an easily understood format.
The ULM has internal auto-scaling across the ranges 10 to 20,000 Lux and 10 to 1,000 μW/Lumen. In the normal mode of operation it displays light levels on its alpha-numeric LCD screen as Lux, μW /Lumen and mW/m2. Lux is detected by a photometric diode and UV by a silicon carbide sensor which provides a response over the range 250 to 400nm. The sensors are mounted adjacent to each other, with cosine-correction of both Lux and UV.
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Last Updated: 28th July, 2015