11W (=65W) Energy Saving Spiral CFL 2700K Warm White colour Light Bulb E14 Small Edison Screw SES Cap, 10 Years, 10,000 hours compact fluorescent by Lowenergie (1) : Amazon.co.uk: Lighting
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Philips LED 433557 Energy Saver Compact Fluorescent T2 Twister (A21 Replacement) Household Light Bulb: 6500-Kelvin, 23-Watt (100-Watt Equivalent), E26 Medium Screw Base, Daylight Deluxe, 4-Pack : Amazon.co.uk: Home & Kitchen
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EcoSmart 100W Equivalent Daylight (5000K) Spiral CFL Light Bulb (4-Pack) : Amazon.co.uk: Lighting
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A Guide To Compact Fluorescent Lamps (CFL) & Fluorescent Tubes - The Lightbulb Co. UK
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Compact fluorescent lamp - Wikipedia
