With a light output equivalent to a 135W incandescent GLS but a power consumption of just 105W, these halogen Lightbulbs Directly replace existing GLS light bulbs to save 30% of your electricity costs. Features a ES-E27 Edison screw (27mm) base/cap.These light bulbs also have an increased life of 2000 hrs and on top give out significantly reduced heat and is a cost effective version of a CFL. Also known as an A60 light bulb.Need more help in choosing a suitable light bulb? Read our guide What is a GLS Light Bulb.