Energy Saving Light Bulb 4 Pin CFL Fluorescent Lamp Cool White 10w 13w 18w 26w
Energy saving light bulbs, CFL (Compact Fluorescent). Thirdly, if possible try the bulb in a light that is still working to check the new bulb isn't faulty. If all else fails get in touch. Cool white / 840 / 4000k light colour.