Varius EF 250WThis is a TwinPack deal. You'll receive two (2) bulbs. The Original HN Sunlight Varius EF 250W is a high quality bulb made with the finest raw materials. It is designed to provide high actinic output and long service life. The optimized spectral output guarantees rapid curing and short exposure times with the industries best dot to dot quality. The 48. 5 mm long Varius EF 250W has a typical lifetime of 700 hours. optimized spectral output short