Re: Batlamp - the ultimate LED streetlight for protecting the night sky? (fwd)

[Jan Hollan <jhollan@amper....muni.cz>]

Dear Roel Derks,

Dr. Haenel gave me a contact to you, saving me time to dig it out of 
innolumis site. He reacted to the e-mail below (it had been published 
automatically within my list archive, as
 http://amper.ped.muni.cz/darksky/2012/000092.html ).

I believe that the amber LED luminaire has a potential to be used in Czech 
villages, when some improvements would be made, like shifting those 200 
cd/klm from 80 degrees to 60 degrees... I'd be also interested in amber 
LEDs with a broader spectrum (I use such at home), offering some colour 
recognition in a green to red range. Another possibility would be to add a 
couple of warm-white diodes to provide traces of blue light (the vision 
system adapts to it easily, sensitivity of S cones being at maximum, but 
still seeing in colour, when the light is faint enough, like the amount of 
blue from almost full moonlight at 0.1 lx).

Could you please give me some hint on the price of your 9 W bat luminaire?

The basis of my interest may be seen from my recent article for a 
conference (limited to 4 pages, so omitting many things)
  http://amper.ped.muni.cz/light/drafts/hollan_light4h.pdf

yours sincerely
 Jenik Hollan

---------- Forwarded message ----------
Date: Tue, 2 Oct 2012 12:08:16 +0200 (CEST)
From: Jan Hollan <jhollan@amper....muni.cz>
To: magnitude6@yahoogroups...
Cc: darksky@amper....muni.cz
Subject: Re: [magnitude6] Re: Batlamp - the ultimate LED streetlight for
    protecting the night sky?


> > I've put the illuminance plots and luminous intensity tables to
> >   http://amper.ped.muni.cz/light/ies2/innolumis/

The ldt file has no data over 90, so no ULR can be computed ;-)
 -- see the tables. We can just realistically hope that all number over 90 
degrees would be 0.0 cd/klm. Omitting values over 90 degrees in photometric 
files is a bad habit. Here it presents no swindle for sure, but for another 
luminaires, it could.

We have to ensure 0 cd/klm. ULR is to be 0,00 %, it mostly is with 0 cd/klm.

I've added some text (and an *.ies file) to the above directory and computed 
a case for spacing 3, at 5 m height, using my own online php.

It looks nice, see for yourselves. The only problem is with so much light 
falling behind the lamps, making them a really good choice just for a 
situation of a road in front of the poles and a broad sidewalk behind them.

cheers, jenik

----------------------------------------------------------------------
                             Jan Hollan, Ph.D.

CzechGlobe - Global Change Research Centre of the Acad. Sci. Czech Rep.

AdMaS - Advanced Materials, Structures and Technologies Centre 
of the Brno University of Technology

			           home:
Lipová 19, 602 00 Brno                         fix. +420 5 43 23 90 96
                            mob. +420 606 073 562

             volunteer of the Ecological Institute Veronica
Panská 9, 602 00 Brno, Czechia                  http://www.veronica.cz

e-mail: hollan@ped....cz              http://amper.ped.muni.cz/jenik
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