>That's it, I have to come up with a solution. On small airports, people
>steal light bulbs from the runway. How to prevent (detect) it ? And maybe
>detect burn-out bulbs as well ?



Use low voltage bulbs, say 48V.  They won't last an instant at home, and
you'll
not have any repeat thefts.   The downside is that the current doubles.

Higher voltage bulbs could work too, but unless you use 220, they will be
prised as "forever" bulbs, and you'll probably have MORE losses.