The GLS Standard Incandescent Light Bulb was the mainstay of the UK lighting market for decades, illuminating homes and commercial applications from ceiling pendants and lamps. This General Lighting Service bulb-shaped light source is no longer manufactured in its original form, however 'Rough Service, Shock-Resistant and 'Industrial Use' GLS incandescent bulbs are. These lamps offer the same dimmable, warm white light, a pearl or clear finish and Edison Screw or Bayonet Cap base fittings. We also stock GES versions suitable for outdoor fixtures. All standard GLS incandescent bulbs offer an average life of 1000 to 2000 hours. For a more energy efficient GLS, please check out our energy saving and LED sections.