Osram has published a backgrounder on the relationship between lightning strikes and LED streetlamps. The firm has its own range of protection devices, but the document has useful information beyond these.
Nichia has saved you from buying secondary optics by making an LED with a batwing beam. Intended for street and outdoor lighting, the device is called NVSW119AT-D1 and is 7.1×4.96mm, and 3.95mm high. Typically 138 lm is produced at 350mA (3V forward). The beam pattern is a little hard to describe, so this plot will save a thousand words:
Braun Lighting Solutions of Berlin has worked with Future Lighting Solutions to install LED lighting in the historic Schinkel street lights in the city of Leipzig, writes Richard Wilson.
Makers of LED optics are vying for business as streetlight buyers discover the benefits of solid-state lighting, writes Technology Editor Steve Bush. 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.
It concludes that LED lighting is the best, but induction lighting - where induction fields energise a gas mixture in a sealed glass cell - comes a close second.
Last week I attended the Light + Building trade show in Frankfurt and found myself thinking that it should be renamed the LED + Building show.