Illuminate your space with these specialized 13W Type A fluorescent light bulbs, designed specifically for Ottlite lamps manufactured before 2008. These replacement bulbs feature a GX23 base and come equipped with a magnetic ballast for reliable operation. With a color temperature of 5500K, they provide bright natural daylight illumination that's ideal for detailed tasks, reading, or crafting. Each package includes two bulbs (PL13-A-FFP model), ensuring you have a backup ready when needed. These bulbs are a perfect match for the T13330 specification, maintaining the signature lighting quality you expect from your lamp. The fluorescent technology delivers consistent, flicker-free illumination while operating at an energy-efficient 13 watts. Compatible only with pre-2008 Ottlite models, these bulbs help extend the life of your existing lamp fixture.