These 25W translucent blue colour BC-B22d bayonet (22mm) incandescent GLS light bulbs are both heat and water resistant making them ideal for decorative festoon chains. Harlequin light bulbs are also protected from vibrations and have a flake-free coating, so add this light bulb to your decorations today. Also known as an A60 light bulb.Please note that even though the light bulb itself is IP65 rated, it must be used in a suitable IP65 rated socket in order for it to be used outside safely.Need more help in choosing a suitable light bulb? Read our guide What is a GLS Light Bulb.