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Optics firms go modular for LED street lighting

Makers of LED optics are vying for business as streetlight buyers discover the benefits of solid-state lighting. It is not necessarily efficiency that make streetlight aficionados sit up, as starkly yellow old-tech low-pressure sodium lights offer 300 lm/W, compared with 100 lm/W from LEDs. What is attractive, is long life. LED luminairs have no vacuum or electrode-eating plasma and well designed example are expected to live for over 50,000 hours.

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