OSRAM CFL Square offers a slim compact design which makes it ideal for low or shallow wall/ceiling luminaires i.e., 2D/Bulkhead.
4-pin push in design makes installation effortless, whilst the A class rating guarantees great energy efficiency. When talking about its economy we also have to mention the 7500-hour average lifespan which makes this the top choice in its range. 
Main uses for this kind of lamp are seen in schools, restaurants, hotels, supermarkets and other public buildings. Also known as PL-Q, CFL square, Butterfly lamp, Double D lamp.
This lamp is suitable for electronic and conventional control gear and works with OSRAM QUICKTRONIC.