Specifying SON

摘要

Specifying light sources for any application is often a balancing act between the quality of lighting, the energy performance and the longevity of the lamp. In the case of road and tunnel lighting the latter is particularly important because of the cost of ownership issues associated with re-lamping.rnHere, high pressure sodium (SON) is still the first lamp of choice in the majority of applications but it's an unfortunate fact that not all SON lamps are equal. Indeed, over the last few years, as life cycle costs have risen up the agenda, a number of SON lamps have been introduced to the market that promise the earth but deliver somewhat less.