An overview of ground illuminance distribution as produced by  
luminaires by Philips in Hostetin.
The file <A href="all_5.htm">all_5.htm</A>
shows a photometric thumbnail overview for all of them when put 5 pole 
heights apart.
 Clicking on 
any thumbnail opens a larger image.

<P>The most interesting part of this directory is the documentation, 
how an added screen inside the luminaire might help its function, 
<A href="adaptation.htm"> adaptation.htm</A>

<P>Specific illuminances are coded logarithmically by colours. Each 
colour comprises one decadic order, shades within the colour 
are 0.5&nbsp;mag each (so five shade steps are 2.5&nbsp;mag, what corresponds to 
ratio of 1:10). 

<P><img src="lum.png" alt="illuminance scale">

<P>Values below the scale are illuminance / 1&nbsp;lx. This is for
(unrealistic) &ldquo;unit&rdquo; case
that luminaires would have lamps producing 1&nbsp;klm only,
would be point-like and just 1&nbsp;m over the terrain.
Amore realistic case would be lamps producing 10&nbsp;klm each and
being 10&nbsp;m over the terrain: then the illuminances would be just
10&times; less.

<P>The colour overview has been created using a Jan 2007
version of ies2tab.