OSRAM energy saving light bulbs.

Compact fluorescent lamp or (CFL) are designed to replace an incandescent lamp and can fit into most existing light fixtures formerly used for incandescents.Every CFL bulb you switch to will save 6.5 tonnes of caron being emmited.Compared to general service incandescent lamps giving the same amount of visible light, CFLs use less power and have a longer rated life.CFLs lasts up to 6000 hours of use compared to incandescent bulbs that usally burn out after 1000 hours of usage.For a given light output, CFLs use 20 to 33 percent of the power of equivalent incandescent lamps.The major problem with Compact Fluorescent lamps is Mercury content. All CFLs have a small amount of mercury in them ( around 5mg, less than a watch battery or an amalgam tooth filling) which could be released if the bulb is broken or damaged. Low-mercury bulbs are now available, check that packaging!