Osram Dulux bulbs (CFL) are available in different bases or caps. From the common E14 and E27 to compact fluorescent 2 to 4 pin.
Do you know that you can save between 50 and 80% more on your electricity bill
15w Osram Duluxstar
15w ≈ 75w
827 / Warm White
Up to 80% less energy consumption compared with ordinary light bulbs