Prismatic deck (or roof light) and bulls eyes give a lovely diffused natural light resulting in a soft lighting effect. They are available in both brass and chrome, or you could have the surround powder coated in a colour of your choice or just clear to retain the shine.
There are two types of deck prisms available:
Deep Sided or Deep Framed - these prisms are suited for thinner/steel decks or roofs where the actual glass itself sits within the deep brass frame with the flange/lip being screwed to the deck or roof.
Rebated - these prisms are only suited for thick decks or roofs where the actual glass itself is rebated into the deck or roof with the brass surround being screwed to the surface to give a nice finish.
Bulls Eyes are usually attached to the deck or roof.