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From the early 1900s, Davey & Company has been producing a range of deck prisms to bring natural light down below.
Manufactured in England these prisms are solid glass with either flat bronze frames, where the glass is rabetted in, or deep bronze frames for thinner decks. In both cases a marine-quality black mastic should be used for mounting - such as a polysulfide or synthetic rubber. To improve adhesion, the glass should be abraded first where the sealant touches.
Frames can be chrome plated to order or, in some cases, supplied in polished stainless steel.
The style of this prism is ideal for thinner decks such as steel, aluminium or fibreglass.
The frame is fixed to the deck first and the glass is then set into the frame from the top using a good quality marine mastic.
The "melon" deck light has the greatest light output, but also the greatest depth, so care should be taken when fitting above walkways or other areas to ensure adequate headroom.