This 15 Watt 240V Compact Fluorescent Lamp (CFL) GLS Lamp (10000hrs) - is available in warm white for use in areas where a warm, cosy feeling is required. This 15W compact fluorescent lamp has an equivalent light output of a standard 75 Watt light bulb. Making approximate assumptions of each unit of electricity costing 10p if a standard 75 Watt bulb was used for 4 hours each day for a year it would cost £10.80 to operate. This equivalent lamp with the same light output but only using 15 watts of electricity would cost £2.16 to operate. In addition this lamp would be expected to last up to 8 times as long as a standard lamp.