Q 729 Z4The Amba Q 729 Z4 compatible* lamp, 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 115 mm long Q 729 Z4 has a factory warranty of 600 hours. optimized spectral output short exposure times short curing times customer approved Length: 115 mm