2D fluorescent light bulbs were developed for special fixtures that needed a high light output compact light source. They're also used in low profile fixtures that need a minimum space.
2D technology improves on conventional compact fluorescent lamps (CFLs) in several ways. The lamp spreads light more uniformly, without the end shadows created by the typical CFL. The slim, flat shape fits into many sleek modern fixtures. And it retrofits easily into existing portable fixtures (table and floor lamps).
