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searching for Hyperradiant Fresnel lens 2 found (26 total)

alternate case: hyperradiant Fresnel lens

Sule Skerry (583 words) [view diff] no match in snippet view article find links to article

Board Heritage category A listed building Focal height 34 m (112 ft) Lens "hyperradiant" Fresnel lens Range 21 nmi (39 km) Characteristic Fl (2) W 15 s

Czołpino Lighthouse (173 words) [view diff] exact match in snippet view article find links to article

Heritage immovable monument Light Focal height 75 metres (246 ft) Lens hyperradiant Fresnel lens Range 21 metres (69 ft) Characteristic LFl Fl W 8s.