Osram Dulux D 18W 840 Specifications : The Osram Dulux D Can Be Used In Combination With A Conventional Ballast. The Lamp Has A Short And Compact Lamp Base Type G24Q-1. This Means That Each Of These Compact Fluorescent Lamps Has A Base With 4 Pins. The Lamps Osram Dulux D/E 13W 840 Has A Length Of 131 Mm. Osram Dulux D 18W 840 Has An Energy Rating Label Of B And An Average Lifespan Of 20,000 Hours. If The Lamp Starts Flashing And Has A Delayed Start-Up Time Then It Needs Replacing. Osram Dulux D 18W 840 Uses : The Osram Dulux D/E 13W 840 Can Be Used In Many Different Places. The 4000K Produces A Sharp White Light That Is Referred To As 'Cool White'. This Is Ideal For Working Environments And So Is Most Commonly Found In Warehouses. Note: If You Are Currently Using A Fluorescent Lamp, You Cannot Select A Different Wattage From Which You Are Now Using. This Is Because Different Wattages Require Different Gear And Have Different Lengths.