This 13W Cool White 4000K 4 Pin PLT Compact Fluorescent lamp offers savings of up to 80% in energy usage compared to an incandescent and an impressive 8000 hour lamp life. The 13 Watt output of this lamp is the equivalent of a 40W incandescent bulb. This is a high quality high efficacy long life lighting solution perfect for applications where a compact light source is required. This lamp requires external control gear to operate.