Light curtains are opto-electronic devices that are used to safeguard personnel in the vicinity of moving machinery with the potential to cause harm such as (but not limited to) presses, winders and palletisers. Light curtains can be used as an alternative to mechanical barriers and other forms of traditional machine guarding. By reducing the need...
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http://en.wikipedia.org/wiki/Light_curtain
A batten of low voltage narrow angle lamps, usually 8 to 10, wired in series, used to create a narrow strip of intense light.
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https://www.encyclo.co.uk/local/20411
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