Fliegerhorst "Reflective Brick"

[ClinA-78]

Gent's,

Please excuse this strange title as I don't know the word calling this kind of earthenware/porcelain 'brick' (roughly the same stuff like isolator) which was found in the middle of a former German taxi-track, leading to one of the runways of the Florennes airbase (or Fliegerhorst as it was built by Germans in '42).
Measures are 14/7/6 cm. As you can see, only the top emerged from the soil. Markings at the bottom are D 6608 B and the manufacturer seems KLEFFEL.
I don't know its main purpose but it seems they were used as a 'passive lighting' device, reflecting the moonlight in order to lead the Nachtjager to the take-off point without using its headlights (Intruders were highly feared).
I am wondering if this device was used somewhere else (in Belgium or Germany).

By the way, I am searching any info about Florennes airbase architecture. We get a lot of info's about LW and USAAF units, plans, sketches but very few about the German buildings establishment itself and especially pictures (!)

I will display the history of airbase (and rare artefacts) during our INTERNATIONAL AIRSHOW on the 23-24 June 2012. More will follow with heavy surprises as this display will occur in a still-preserved German shelter!

Thank you for your attention and see you at the Airshow!

ClinA-78