amisiek napisał(a):Penning = High pressure sodium lamp with Penning gas mixture. Example - Philips SON-H, POLAM WLSP. Works on mercury gear without high voltage ignitor. It's direct replacement for mercury vapour lamp. Gives a bit more reddish colour than a typical high pressure sodium due to different gas inside discharge tube.
Oh, thanks, now I understand:) Yes, I have one russian, made in 1993, DNaS-210 (you can see it here http://fotkidepo.ru/?id=photo:598363) But theese russian bulbs are not very good - with the ballast for mercury lamps they start not every time, and some russians say, that they can destroy a ballast.