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Standard/GLS Bulbs | Light Bulbs | Screwfix.comA GLS Light bulb looks like a standard 60w bulbs that were throughout our homes, the 60w GLS light bulbs were not energy efficient so have been replaced with ECO-Halogen, CFL, LED GLS bulb versions which use up to 85% less energy. | 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