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The older 13 Watt Replacement Tube is for lamps with a magnetic ballast. To keep it simple, we'll call this tube Option 1. The newer kind of tube is used with lamps that have an electronic ballast. We'll call them Option 2. How do you tell the difference? Glad you asked! We've put together this handy-dandy guide to help: How do you tell the difference? Glad you asked! We’ve put together this handy-dandy guide to help: 1. When did you buy your lamp? Before January 2008 ? Option 1. After January 2008 ? See Question 2. 2. Is there an “E” on your tube, lamp or bulb box? Note that there are three places the “E” might appear. Yes? ? Option 2. OTT-T1333E No? ? Option 1. OTT-T13330