These clear finish 100W GLS light bulbs emit the familiar warm white light of traditional incandescent light bulbs, and the BC-B22d bayonet (22mm) cap will fit existing light fixtures, making it easy to find a direct replacement for your current light bulbs. Also known as an A55 light bulb.Incandescent GLS light bulbs have been in short supply since the EU introduced a phased ban on them several years ago. Since September 2018, all incandescent light bulbs have been banned from sale in the UK (with the exception of specialist light bulbs that have no energy-saving alternative).Special purpose traffic signal grade light bulbs are a great replacement for the incandescent filament light bulbs that have been in use for so long. They are sturdier than traditional light bulbs and are most commonly used for the illumination of traffic lights and other roadside lights. Not suitable for household room illumination.Need more help in choosing a suitable light bulb? Read our guide What is a GLS Light Bulb.