And then call an attorney and prepare for your lawsuit after a dead body
ends up on the runway!  (Some people have weak hearts)

Take a photo transistor and put it in the housing in such a way that only
the bulb will give it a good transition (protection from sunlight tripping
it). After you convert it to a digital signal you can do with it what you want.

Alberto Smulders wrote:

> Hmmm... connect a fence electrifier to the armatures of the lights (make one
> out of a car ignition coil, a 555 timer (or a PIC ???? - a bit overkill I
> think.....), power transistor and a power
> supply) - 100 % effective against theft....
>
> Regards,
>
> Alberto Smulders
> InSAD - Encarnaci—n, Paraguay
> insad@itacom.com.py
>
> -----Mensaje original-----
> De: Chris Matus <ctm@sprynet.com>
> Para: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
> Fecha: MiŽrcoles 20 de Mayo de 1998 10:24
> Asunto: Re: How to prevent light bulb theft in airport runways ?
>
> >> Use the same method that is used on construction sites: a regular
> >> looking bulb with a left hand thread.
> >
> >Useless unless you have matching sockets.