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Sylvania CFL GLS | Standard/GLS Bulbs | Screwfix.comGLS CFL's or GLS Compact Fluorescent Lamps are standard lampd which fit into most domestic light fittings. GLS are a standard bulb shape and most popular for homes. The benefit of CFL is that compared to traditional bulbs they are 80% Energy Saving | 1000's of products available in-store and online at low trade prices | FREE next day delivery available | FREE collection in 5 minutes | FREE Returns