60-Watt Equivalent T4 Energy Saving CFL Light Bulb Cool White (1-Pack)Sylvania DULUX D ECOLOGIC lamps are long life, energy saving alternatives for incandescent lamps. When paired with Sylvania ECOLOGIC linear fluorescent lamps, all the fluorescent lamps in an installation will be TCLP compliant. More compact than the DULUX S ECOLOGIC lamps, the 9 Watt and 13 Watt DULUX D ECOLOGIC lamps are ideal for retrofitting existing fixtures and for use in dedicated, energy saving fixtures where a small overall length is required.