... phosphor powder.7.) Low heat emission.8.) No flash.Application: Home, Offices, Shops, Department Stores, Clubs, Restaurants, Hotels, SupermarketsModelVoltage(V) ... noticeable warm-up period, but others can take up to a minute to reach full brightness, or longer in very cold ... CFLs are also available for lights using a dimmer switch.How to choose CFL:1.) Choose your preferred light quality,2.) ...