1. Good quality & reasonable price 2. Fine photochromism 3. Long life, low cost 4. OEM & professional design Blended-light Mercury Lamps (coated)Features:Needless to use additional ballast and used as a substitute of incandescent bulbEasy to install, low investment and maintenance costSlight color temperature shift, fine photochromism, long lifeExcellent color rendering, high luminous ...