Tom Webster from the D.W. Windsor Limited was so kind and sent me some examples of their luminaires with sophisticated optics, and comments on them. Not all of the examples are of strictly full-cut-off type, as some visible convex type of refractor had been sometimes demanded, but even in those cases the glare and light pollution are minimized. I hope the examples (the following images and texts by Tom) will inspire you. Jan Hollan, N. Copernicus Observatory and Planetarium, Brno.


Leeds town centre -- note the excellent road uniformity as well.


Blackpool


Torquay harbour -- we had to calculate 3 levels, the car park, the boat moorings at high tide and the boat mooring at low tide. Flat glass was specified so as not to interfere with navigation in the main channel.


East Ham High Street require tight optical control due to the CCTV surveilance and required heritage luminaires due to the aesthetics of the project. Stars are even visible in the photograph.


Putney bridge across the Thames. Again heritage lighting with tight optical control -- some stars are visible in this photograph!


The cut off on the building roofs is clearly visible.


In this project in central Birmingham the special globe luminaires were required with lit upper and lower hemispheres for aesthetic appearance. In the interests of light pollution control and performance this was achieved by using a fully cut off Diamond reflector. A small hole was cut into the top reflector to allow light into the opal glazed upper hemisphere. Then a specular aluminium cone was fixed to the inside top of the upper hemisphere to reflect the upward light back down and around the sides of the upper hemisphere. The results are a luminaire which looks fully lit in the upper hemisphere but in reality generates practically no upward light pollution as can be seen by the light thrown on the building fascias!


This housing project in central London very clearly shows absolute cut off.


This housing project by day and night very clearly illustrates how an attractive luminaire can also be very effective in light control. Once again stars are even visible in this photograph.

Best regards
Tom Webster

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