Bell 04329 15W LED Linear 4 Pin - 2G11, 4000K 1350lm. The LED BLL/BLS Lamps are an ideal replacement for old hat CFL technology. With a 5 year guarantee the LED BLL Lamps offer a cost-effective energy saving solution without the need to replace a complete fitting. Ideal for public buildings, offices, shops, supermarkets, hotels, restaurants and around the home.