Incandescent Lamp, Colour/Finish: Yellow, Green, Red
From Amazon
Crompton Lamps 15W Pygmy BC-B22d Dimmable Yellow 40lm BC Bayonet B22 Incandescent Sign Coloured Outdoor External Festoon Light Bulb
Lamps 2U Direct
15 watt BC-B22d Yellow Coloured Pygmy Light Bulb