This pack contains four 11W Osram CFL bulbs with a 2G7 4-pin base. They emit a cool white light with a colour temperature of 4000K and a luminosity of 900 lumens. The bulbs have a life expectancy of 20000 hours and dimensions of approximately 220mm (215mm excluding pins) in length and 37mm in width. These energy-saving compact fluorescent lamps (CFLs) use less power and last longer than conventional bulbs, offering significant cost savings over time. They are compact and slim, ideal for various lighting applications.