[Darksky] [magnitude6] Re: Batlamp - the ultimate LED streetlight for protecting the night sky?

Jan Hollan jhollan at amper.ped.muni.cz
Tue Oct 2 12:08:16 CEST 2012

> I calculated the ULR with Dialux and it gave 0,0%,
> Andreas
> --- In magnitude6 at yahoogroups.com, Jan Hollan <jhollan at ...> wrote:

>> 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 

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 

cheers, jenik

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