are the variants suggested by Laixicon



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Note added at 2003-02-25 10:20:50 (GMT)
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it is the twilight switch: see link

http://www.danlers.co.uk/eng/security/twsw.htm

Features
Switches outdoor lights on at dusk and off at dawn. Ideal for all night security.
Adjustable photocell. Extremely compact polycarbonate moulding.
Vandal resistant



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Note added at 2003-02-25 10:26:12 (GMT)
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HitList
1. Daemmerungsschalter(1) BTL - MNV70 - 24160

Document 1


Subject Electrical Engineering - Electronics (EL)
Transport (TR)



Definition durch Tageslicht gesteuerte Vorrichtung,die ein elektrisch betriebenes Feuer im allgemeinen etwa bei Sonnenuntergang oder Sonnenaufgang automatisch ein-oder ausschaltet

Reference IALA Int Seezeichen-Wb 2:optische Seezeichen
(1)
TERM Daemmerungsschalter

Reference IALA Int Seezeichen-Wb 2:optische Seezeichen


Definition a device,operated by daylight,that automatically lights and extinguishes an electric light,usually lighting it at or about sunset and extinguishing it at or about sunrise

Reference IALA Int Dic Aids Marine Navigation 2:visual aids
(1)
TERM daylight control

Reference IALA Int Dic Aids Marine Navigation 2:visual aids
(2)
TERM sun relay

Reference IALA Int Dic Aids Marine Navigation 2:visual aids
(3)
TERM sun switch

Reference IALA Int Dic Aids Marine Navigation 2:visual aids



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Note added at 2003-02-25 10:57:33 (GMT) Post-grading
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The last section is from Eurodicautom. My daughter somehow got hold of the keyoboard and deleted the link.