🚀 go-pugleaf

Thanks to everyone for help on this.

Don, your suggestion is ok if we can get access to the internals of
the lamps, but we have to do this remotely from the 'feeder pillar'.
The idea is to retro fit networks which have up to 20 or so lamps on
the same 'feed'.

Cheers,

Dale

don@manx.misty.com (Don Klipstein) wrote in message news:<slrnb3rkjf.o7s.don@manx.misty.com>...
> In article <65050f09.0301282112.294b0685@posting.google.com>, Dale wrote:
> >Hi everyone out there.
> >
> >Im looking at detecting failure of HPS street lamps where say you have
> >up to 20 lamps on a particular circuit. Im only interested in knowing
> >that one or more lamps are in failure state (i.e. from the moment they
> >start to go through their on-off cycle)
> >
> >(If anyone has got ideas on when a particular lamp has failed, via a
> >single feeder circuit, of course I would be very interested, even
> >maybe have a job for you!!! ;)
> 
>   How about detecting voltage applied to the ballast and lack of current 
> flowing through the lamp?
>   If the lamp is not the pulse start kind (although most HPS lamps are) 
> then detecting full line voltage (or ballast open circuit output voltage) 
> across the socket may be easy and a sign that the lamp is not working.
> 
>   NOTE - allowances must be made somewhere for lamps requiring time to 
> cool down after a brief power outage before they are able to restart.
> 
>  - Don Klipstein (don@misty.com)