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These GLS compact fluorescent CFL energy saver light bulbs are designed to replace traditional GLS bulbs.They consume just 12W of electricity and with a rated life of 6,000 hours they will last up to 6 times longer than the traditional incandescent.Features an ES-E27 Edison screw (27mm) base.Need more help in choosing a suitable light bulb? Read our guide Choosing Compact Fluorescent Lamps