The best light to work in is Daylight because Daylight bulbs guarantee perfect colour matching, give you greater eye comfort, help you see details & small print clearly. All Daylight bulbs mean perfect light & low heat so you can work for hours in comfort. Energy saving 20 Watt Daylight bulb with bayonet cap fitting. Equivalent brightness ratings: -11W Daylight Energy Saving Bulb is the equivalent of a 60W conventional bulb -18W Daylight Energy Saving Bulb is the equivalent of a 100W conventional bulb -20W Daylight Energy Saving Bulb is the equivalent of a 100W conventional bulb -28W Daylight Energy Saving Bulb is the equivalent of a 120W conventional bulb