White 15W incandescent golfball (round) Colourglazed style light bulb with a BC-B22d bayonet (22mm) cap.Colourglazed light bulbs have a internal coloured coating which will not wear away and provides a strong and vibrant colour. These light bulbs are vacuumed filled so are ideally suitable for indoor and outdoor use.Although white in appearance when turned off, this lamp will glow with a yellow/orange colour when illuminated due to it\'s low wattage and vacuumed filled glass envelope.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 Golfball Light Bulb.