Compact "TE" style 4 Pin lamps in a triple turn configuration are commonly used in commercial and some domestic luminaires such as downlighters, bulkheads, pendents and other suitable energy saving applications.
“Not a fitting I would choose to install. Replacement 4 pin bulbs are fiddly to fit as you have to put pressure on the glass tubes. I broke one getting it in, just as well I bought a spare.”
